Where can I get source code for the book [book title]?

Where can I get source code for the book [book title]?

  Here is a list of the places I know to get source code for network
  programming books.  It is very short, so please mail me with any
  others you know of.

  Title: Unix Network Programming
  Author: W. Richard Stevens (rstevens@noao.edu)
  Publisher: Prentice Hall, Inc.
  ISBN: 0-13-949876-1
  URL: http://www.noao.edu/~rstevens

  Title: Power Programming with RPC
  Author: John Bloomer
  Publisher: O'Reilly & Associates, Inc.
  ISBN: 0-937175-77-3
  URL: ftp://ftp.uu.net/published/oreilly/nutshell/rpc/rpc.tar.Z

  Recommended by: Lokmanm Merican (lokmanm#pop4.jaring.my@199.1.1.88)
  Title: UNIX PROGRAM DEVELOPMENT for IBM PC'S Including OSF/Motif
  Author: Thomas Yager
  Publisher: Addison Wesley, 1991
  ISBN: 0-201-57727-5