O`Brien, James A., 1936-, author
McGraw-Hill/Irwin, 2004
Buku Teks
edited by Sylvia Simmons
Aslib, 1999
Buku Teks
Kelly, Joseph F.
Collier-Macmillan , 1970
Buku Teks
Kay, Emanuel
Amacom , 1974
Buku Teks
Dickson, Gary W., author
McGraw-Hill, 1985
Buku Teks