Mason, J. Barry
Business Publications, 1987
Buku Teks SO
Cahill, Jane
Fairchild Publications, 1960
Buku Teks SO
Bellenger, Danny N.
Richard D. Irwin, 1983
Buku Teks SO
Kelley, Pearce Clement
Prentice-Hall, 1957
Buku Teks SO
Brown, Paul L.
Ronald Press, 1953
Buku Teks SO