diff --git a/doc/top/refs.top b/doc/top/refs.top
index 5cac9ed6b..c4438987a 100644
--- a/doc/top/refs.top
+++ b/doc/top/refs.top
@@ -77,3 +77,8 @@ Intermediate Code
 %C Reading, Massachusetts
 %D 1978
 
+%T Some Topics in Parser Generation
+%A C.J.H. Jacobs
+%R Rapport IR-105
+%D October 1985
+%I Vrije Universiteit, Amsterdam