Monsen, R. Joseph, author
Houghton Mifflin, 1967
Buku Teks
Beach, Dale S., author
Macmillan, 1975
Buku Teks
edited by Max S. Wortman
Allyn and Bacon , 1970
Buku Teks
American Management Assosiation, Inc. (c.1958), 1958
Buku Teks
Hicks, Philip E., author
McGraw-Hill, 1998
Buku Teks