LeBoeuf, Michael, author
McGraw-Hills, 1982
Buku Referensi
edited by Alan M. Glassman
A Wiley/Hamilton Publication, 1978
Buku Teks
Higgins, James M., author
Macmillan, 1994
Buku Teks
Miner, John B., author
W.B. Saunders, 1975
Buku Teks
Hitt, Michael A., author
West Publishing Company, 1989
Buku Teks