Beck, Charles E.
Prentice-Hall, 1999
Buku Teks SO
Mayerson, Evelyn W.
W.B. Saunders, 1979
Buku Teks SO
Roebuck, Deborah Britt
Business Expert Press, 2012
Buku Teks SO
Munter, Mary
Prentice-Hall, 1982
Buku Referensi
Machin, John L.J.
McGraw-Hill, 1980
Buku Teks SO