Brady, Robert N.
Reston Publishing Company, 1982
Buku Teks
Lugton, Robert C.
Prentice-Hall, 1978
Buku Teks
Gleason, Marion N.
The Williams & Willkins, 1969
Buku Teks
Slusser, Robert M.
Stanford University Press, 1959
Buku Teks
Kaplan, Robert S., author
Harvard Business School Press, 2004
Buku Teks