diff --git a/src/cco-modules/AgentOntology.ttl b/src/cco-modules/AgentOntology.ttl
index 0a24b3f..7cfe3c7 100644
--- a/src/cco-modules/AgentOntology.ttl
+++ b/src/cco-modules/AgentOntology.ttl
@@ -25,6 +25,7 @@
 
 ###  http://purl.org/dc/terms/bibliographicCitation
 dcterms:bibliographicCitation rdf:type owl:AnnotationProperty .
+dcterms:bibliographicCitation rdf:type owl:AnnotationProperty .
 
 
 ###  http://purl.org/dc/terms/created