Computer Systems Research Group, UC Berkeley. 4.4BSD User's Reference Manual. O'Reilly & Associates, Inc., 1994. ISBN 1-56592-075-9
Computer Systems Research Group, UC Berkeley. 4.4BSD User's Supplementary Documents. O'Reilly & Associates, Inc., 1994. ISBN 1-56592-076-7
UNIX in a Nutshell. O'Reilly & Associates, Inc., 1990. ISBN 093717520X
Mui, Linda. What You Need To Know When You Can't Find Your UNIX System Administrator. O'Reilly & Associates, Inc., 1995. ISBN 1-56592-104-6
Ohio State University has written a UNIX Introductory Course which is available online in HTML and postscript format.
Jpman Project, Japan FreeBSD Users Group. FreeBSD User's Reference Manual (Japanese translation). Mainichi Communications Inc., 1998. ISBN4-8399-0088-4 P3800E.