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SCO UNIX in a Nutshell by The staff of O'Reilly Media, Ellie Cutler February 1994 $29.95 USD (Read Reviews)	Linux in a Nutshell by Jessica P. Hekman, The staff of O'Reilly Media OUT OF PRINT
Linux in a Nutshell by Ellen Siever, The staff of O'Reilly Media Second Edition OUT OF PRINT (Read Reviews)	UNIX in a Nutshell: Berkeley Edition by The staff of O'Reilly Media OUT OF PRINT
UNIX in a Nutshell: System V Edition by Daniel Gilly, The staff of O'Reilly Media Second Edition OUT OF PRINT (Read Reviews)