diff --git a/data/abbott/grammar/grammar.xml b/data/abbott/grammar/grammar.xml
index 51cc35c..81e9ea0 100644
--- a/data/abbott/grammar/grammar.xml
+++ b/data/abbott/grammar/grammar.xml
@@ -28,8 +28,9 @@
 							<pubPlace>London and New York</pubPlace>
 							<publisher>Macmillan and Company</publisher>
 							<date>1870</date>
-						</imprint>
+						</imprint>		
 					</monogr>
+					<ref>https://archive.org/details/shakespeariangra0000abbo/page/n5/mode/2up</ref>
 				</biblStruct>
 			</sourceDesc>
 		</fileDesc>