McLean, Gary N.
Paradigm Publishing, 1991
Buku Teks SO
Kalakota, Ravi
Addison-Wesley, 2001
Buku Teks SO
Megginson, William L, Mary Jane Byrd, Charles R. Scott, Leon C. Megginson
Irwin, 1997
Buku Referensi
Jacobson, Ivar
Addison-Wesley Longman, 1997
Buku Teks SO
Langford, Beverly Y.
American Management Association, 2005
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