Hull, John F., author
Gower Press, 1973
Buku Teks
Buffa, Elwood S. (Elwood Spencer), author
John Wiley & Sons, 1975
Buku Teks
edited by Elizabeth Marting
American Management Association, 1957
Buku Teks
Blake, Robert R., author
Tex Gulf , 1968
Buku Teks
Udy, Stanley H., author
Hraf Press, 1959
Buku Teks