diff --git a/GraphQL/XBaseGraphQLTypeHelper.cs b/GraphQL/XBaseGraphQLTypeHelper.cs
index fa06eda..bf3ce11 100644
--- a/GraphQL/XBaseGraphQLTypeHelper.cs
+++ b/GraphQL/XBaseGraphQLTypeHelper.cs
@@ -12,7 +12,7 @@ namespace xDataService.GraphQL
         private readonly XDataServiceConfiguration configuration;
 
         //
-        public XBaseGraphQLTypeHelper(
+        protected XBaseGraphQLTypeHelper(
             XDataServiceConfiguration configuration = null
         )
         {
diff --git a/Interfaces/IXBaseReferencedProvider.cs b/Interfaces/IXBaseReferencedProvider.cs
index 7dfdd58..ff1fe09 100644
--- a/Interfaces/IXBaseReferencedProvider.cs
+++ b/Interfaces/IXBaseReferencedProvider.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Threading;
 using System.Threading.Tasks;
 using xDataService.Models;
 using xModels.Dtos;
@@ -30,41 +31,57 @@ namespace xDataService.Interfaces
         /// </summary>
         /// <param name="providedForId"></param>
         /// <param name="forIndex"></param>
+        /// <param name="cancellationToken"></param>
         /// <returns></returns>
         Task<TModel> GetReference(
             TKey providedForId,
-            int forIndex = 0
+            int forIndex = 0,
+            CancellationToken cancellationToken = default
         );
 
         /// <summary>
         /// Retrieve all Exists References of Specific Provided ID ...
         /// </summary>
         /// <param name="providedForId"></param>
+        /// <param name="cancellationToken"></param>
         /// <returns></returns>
-        Task<IEnumerable<TModel>> GetAllReferences(TKey providedForId);
+        Task<IEnumerable<TModel>> GetAllReferences(
+            TKey providedForId,
+            CancellationToken cancellationToken = default
+        );
 
         /// <summary>
         /// Extract all Referencing Models for Specified Key ...
         /// </summary>
         /// <param name="providedForId"></param>
+        /// <param name="cancellationToken"></param>
         /// <returns></returns> 
-        Task<IEnumerable<XReference<TKey>>> GetAllReferencings(TKey providedForId);
+        Task<IEnumerable<XReference<TKey>>> GetAllReferencings(
+            TKey providedForId,
+            CancellationToken cancellationToken = default
+        );
 
         /// <summary>
         /// Count References ...
         /// </summary>
         /// <param name="providedForId"></param>
+        /// <param name="cancellationToken"></param>
         /// <returns></returns>
-        Task<int> CountReferences(TKey providedForId);
+        Task<int> CountReferences(
+            TKey providedForId,
+            CancellationToken cancellationToken = default
+        );
 
         /// <summary>
         /// Retrieve References of Specific Provided ID as Query ...
         /// </summary>
         /// <param name="providedForId"></param>
+        /// <param name="cancellationToken"></param>
         /// <returns></returns>
         Task<XQueryResult<TModel>> QueryReferences(
             XQuery query,
-            TKey providedForId
+            TKey providedForId,
+            CancellationToken cancellationToken = default
         );
 
         /// <summary>
@@ -72,13 +89,14 @@ namespace xDataService.Interfaces
         /// </summary>
         /// <param name="model"></param>
         /// <param name="providedForId"></param>
-        /// <param name="forIndex"></param>
         /// <param name="connectionId"></param>
+        /// <param name="cancellationToken"></param>
         /// <returns></returns>
         Task<bool> AddReference(
             TModel model,
             TKey providedForId,
-            string connectionId = null
+            string connectionId = null,
+            CancellationToken cancellationToken = default
         );
 
         /// <summary>
@@ -87,11 +105,13 @@ namespace xDataService.Interfaces
         /// <param name="model"></param>
         /// <param name="reference"></param>
         /// <param name="connectionId"></param>
+        /// <param name="cancellationToken"></param>
         /// <returns></returns>
         Task<bool> AddReference(
             TModel model,
             XReference<TKey> reference,
-            string connectionId = null
+            string connectionId = null,
+            CancellationToken cancellationToken = default
         );
 
         /// <summary>
@@ -99,26 +119,29 @@ namespace xDataService.Interfaces
         /// </summary>
         /// <param name="model"></param>
         /// <param name="providedForId"></param>
-        /// <param name="forIndex">if null, removes all</param>
         /// <param name="connectionId"></param>
+        /// <param name="cancellationToken"></param>
         /// <returns></returns>
         Task<bool> RemoveReference(
             TModel model,
             TKey providedForId,
-            string connectionId = null
+            string connectionId = null,
+            CancellationToken cancellationToken = default
         );
 
         /// <summary>
         /// Remove Reference a Model for Specific XRefence<TKey> ...
         /// </summary>
         /// <param name="model"></param>
-        /// <param name="providedForId"></param>
+        /// <param name="reference"></param>
         /// <param name="connectionId"></param>
+        /// <param name="cancellationToken"></param>
         /// <returns></returns>
         Task<bool> RemoveReference(
             TModel model,
             XReference<TKey> reference,
-            string connectionId = null
+            string connectionId = null,
+            CancellationToken cancellationToken = default
         );
 
         /// <summary>
@@ -126,10 +149,12 @@ namespace xDataService.Interfaces
         /// </summary>
         /// <param name="providedForId"></param>
         /// <param name="connectionId"></param>
+        /// <param name="cancellationToken"></param>
         /// <returns></returns>
         Task<bool> RemoveReferences(
             TKey providedForId,
-            string connectionId = null
+            string connectionId = null,
+            CancellationToken cancellationToken = default
         );
         #endregion
     }