--- a/bib	Tue May 15 19:21:27 2012 +0200
+++ b/bib	Tue May 15 21:30:21 2012 +0200
@@ -142,6 +142,7 @@
 %O \s-1ISBN\s0: 978-0-8330-4513-3.
 	\f(CW\s-1 http://www.rand.org/pubs/corporate_pubs/CP537/
 
+%L MH-Book
 %A Jerry Peek
 %T MH & xmh: Email for Users & Programmers
 %D 1995
@@ -164,3 +165,33 @@
 	``should nmh be an MTA or an MUA?
 %D January 2010
 %O \f(CW\s-1 http://www.mail-archive.com/nmh-workers@nongnu.org/msg01876.html
+
+%L K&R
+%A Brian W. Kernighan
+%A Dennis M. Ritchie
+%T The C Programming Language
+%I Prentice Hall
+%D 1988
+%V Second Edition
+%O \s-1ISBN\s0: 0-13-110362-8
+
+%A Stephen R. Bourne
+%T The UNIX System
+%S International Computer Science Series
+%I Addison-Wesley
+%D 1982
+%O \s-1ISBN\s0: 0201137917
+
+%A Marc J. Rochkind
+%T Advanced UNIX Programming
+%S Software Series
+%I Prentice-Hall
+%D 1985
+%O \s-1ISBN\s0: 9780130118004
+
+%A David A. Curry
+%T UNIX Systems Programming for SVR4
+%S Nutshell Series
+%I O'Reilly
+%D 1996
+%O \s-1ISBN\s0: 1565921631

--- a/preface.roff	Tue May 15 19:21:27 2012 +0200
+++ b/preface.roff	Tue May 15 21:30:21 2012 +0200
@@ -133,14 +133,30 @@
 on the shell. Without the power of the shell, MH becomes a motorbike
 without winding roads: boring.
 Introductions to Unix and its shell can be found in ``The UNIX Programming
-Environment'' by Kernighan and Pike or ``The UNIX System'' by Bourne.
+Environment'' by Kernighan and Pike
+.[
+kernighan pike unix prog env
+.]
+or ``The UNIX System'' by Bourne.
+.[
+bourne unix system
+.]
 The reader is
 expected to be familiar with the C programming language, although the
 document should be understandable without knowledge of C, too.
-``The C Programming Language'' by Kernighan and Ritchie is the
-definitive guide to C.
+``The C Programming Language'' by Kernighan and Ritchie
+.[
+kernighan ritchie c prog lang
+.]
+is the definitive guide to C.
 Some book about system-level C programming is worthwile additional
 literature. Rochkind and Curry have written such books.
+.[
+rochkind advanced unix prog
+.]
+.[
+curry system prog
+.]
 As large parts of the code are old, old books are likely more helpful
 to understanding.
 The format of email messages as well as the structure of email transfer
@@ -190,7 +206,6 @@
 Which font for what use.
 Meaning of `foo(1)'.
 RFCs.
-MH vs. nmh vs. mmh.
 .P
 This thesis is devided into XXX chapters, ...
 .P