Jex, Steve M., author
John Wiley & Sons, 2002
Buku Teks
Aamodt, Michael G., author
Wadsworth and Cengage Learning, 2013
Buku Teks
Blum, Milton L., author
Harper & Brothers , 1956
Buku Teks
edited by by Harold J. Leavitt and Louise R. Pondy
University of Chicago Press, c1964
Buku Teks
edited by Harry W. Karn, B. von Haller Gilmer
McGraw-Hill, 1962
Buku Teks