diff --git a/pycaprio/core/adapters/http_adapter.py b/pycaprio/core/adapters/http_adapter.py
index cb5e7bb..ae39221 100644
--- a/pycaprio/core/adapters/http_adapter.py
+++ b/pycaprio/core/adapters/http_adapter.py
@@ -101,8 +101,9 @@ def delete_annotation(self, project_id: int, document_id: int, user_name: str):
                            allowed_statuses=(204, 200))
         return True
 
-    def export_project(self, project_id: int) -> bytes:
-        response = self.client.get(f"/projects/{project_id}/export.zip", allowed_statuses=(200,))
+    def export_project(self, project_id: int, format: str = DocumentFormats.DEFAULT) -> bytes:
+        response = self.client.get(f"/projects/{project_id}/export.zip", allowed_statuses=(200,),
+                                   params={'format': format})
         return response.content
 
     def import_project(self, zip_stream: IO) -> Project:
diff --git a/pycaprio/core/interfaces/adapter.py b/pycaprio/core/interfaces/adapter.py
index c4d58a4..c1f89d4 100644
--- a/pycaprio/core/interfaces/adapter.py
+++ b/pycaprio/core/interfaces/adapter.py
@@ -61,11 +61,13 @@ def annotations(self, project_id: int, document_id: int) -> List[Annotation]:
         pass  # pragma: no cover
 
     @abstractmethod
-    def annotation(self, project_id: int, document_id: int, annotation_id: int) -> bytes:
+    def annotation(self, project_id: int, document_id: int, annotation_id: int,
+                   format: str = DocumentFormats.DEFAULT) -> bytes:
         """
         Retrieves a Document
         :param project_id: The project_id of the Project where the Annotation is located
         :param document_id: The document_id of the Document where the Annotation is located
+        :param format: Format in which the annotation will be downloaded
         :return: Content of the Annotation in bytes
         """
         pass  # pragma: no cover
@@ -98,7 +100,7 @@ def create_document(self, project_id: int, document_name: str, content: IO,
 
     @abstractmethod
     def create_annotation(self, project_id: int, document_id: int, user_name: str, content: IO,
-                          annotation_format: str = DocumentFormats.DEFAULT, state: str = AnnotationStatus):
+                          annotation_format: str = DocumentFormats.DEFAULT, state: str = AnnotationStatus.DEFAULT):
         """
         Creates a Document
         :param project_id: Id of the Project where the new Document will be created
@@ -139,10 +141,11 @@ def delete_annotation(self, project_id: int, document_id: int, user_name: str) -
         pass  # pragma: no cover
 
     @abstractmethod
-    def export_project(self, project_id: int) -> bytes:
+    def export_project(self, project_id: int, format: str = DocumentFormats.DEFAULT) -> bytes:
         """
         Exports a Project into a .zip file.
         :param project_id: Project id.
+        :param format: Format in which the documents and annotations will be exported.
         :return: Zip file in bytes.
         """
         pass  # pragma: no cover