Antony, Arthur
John Wiley & Sons, 1979
Buku Teks SO
edited by Hans-Georg Geissler, Stephen W. Link and James T. Townsend
Lawrence Erlbaum Associates, 1991
Buku Teks SO
O`Brien, James A., 1936-
Richard D. Iriwin, 1986
Buku Referensi
O`Brien, James A., 1936-
Richard D. Irwin, 1986
Buku Teks SO
Hurt, Robert L.
McGraw - Hill - Irwin, 2008
Buku Teks SO