I will try to collect in this file all of the details of the references found in the other files in the UNIX History Graphing Project. At the moment, it's pretty chaotic.
Some of the references included below come from the Unix system family tree / BSD history chart created by Wolfram Schneider, and available at: ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/src/share/misc/bsd-family-tree. Any content in this file which is taken from Wolfram's chart is Copyright ©Wolfram Schneider wosch@FreeBSD.ORG.
Some of the references have been taken from Wolfram Schneider's chart, and have the following abbreviations.
Again, most of the following is from Wolfram Schneider's chart.
Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing Company, Inc., 1994. ISBN 0-201-54777-5
McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John Quarterman. The Design and Implementation of the 4.4BSD Operating System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
Doug McIlroy. Research Unix Reader.
Michael G. Brown. The Role of BSD in the Development of Unix. Presented to the Tasmanian Unix Special Interest Group of the Australian Computer Society, Hobart, August 1993. URL: http://www.de.freebsd.org/de/ftp/article/bsdrole.html
Peter H. Salus. Unix at 25. Byte Magazine, October 1994. URL: http://www.byte.com/art/9410/sec8/art3.htm
Andreas Klemm, Lars Köller. If you're going to San Francisco ... Die freien BSD-Varianten von Unix. c't April 1997, page 368ff. URL: http://www.heise.de
BSD Release Announcements collection. URL: http://www.de.FreeBSD.ORG/de/ftp/releases/
BSD Hypertext Man Pages http://www.freebsd.org/cgi/man.cgi