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-rw-r--r--share/misc/bsd-family-tree3
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diff --git a/share/misc/bsd-family-tree b/share/misc/bsd-family-tree
index 9386229341ad..87136edc81e6 100644
--- a/share/misc/bsd-family-tree
+++ b/share/misc/bsd-family-tree
@@ -479,7 +479,8 @@ was the announcement in Usenet or if it was available as tape.
Distribution UNIX Version 2.9, July, 1983.
[NBD] NetBSD Project, The.
[OBD] OpenBSD Project, The.
-[QCU] Salus, Peter H. A quarter century of UNIX.
+[QCU] Salus, Peter H. A quarter century of UNIX. ISBN 0201547775,
+ EAN 9780201547771
[SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
[TUHS] The Unix Historical Society. https://minnie.tuhs.org/Unix_History/.
[USE] Usenet announcement.