Kurtz, David L.
Business Publications, Inc., 1982
Buku Teks
Johnson, Lewis K.
Allyn and Bacon, 1957
Buku Teks
Still, Richard R.
Prentice-Hall, 1958
Buku Teks
Murphy, Robert F.
Columbia University Press, 1972
Buku Teks
Dodge, H Robert
, Texas Businnes Publicatins , 1973
Buku Teks