Boyd, Branford B.
McGraw-Hill , 1984
Buku Teks
Haimann, Theo
South-Western Pub., 1982
Buku Teks
Leonard , Edwin C., Jr.
South-Western Cengage Learning, 2013
Buku Teks
Tagliaferri, Louise E.
John Wiley & Sons, 1979
Buku Teks
American Management Association, 1957
Buku Teks