Niles, Mary Cushing, author
Harper & Brothers, 1958
Buku Teks
Eccles, Robert G., author
Boston, Mass, Harvard Business School Press
Buku Teks
Bank, John, author
Prentice-Hall, 2000
Buku Teks
Bowman, Cliff, author
Prentice-Hall, 1990
Buku Teks
McFarland, Dalton E., author
Collier Macmillan, 1974
Buku Teks