Schwartzman, Helen B., author
Sage Publications, 1993
Buku Teks
Pugh, D.S.
Penguin Books, 1971
Buku Teks
Yukl, Gary A., 1940-
Pearson Education, 2006
Buku Teks
Haslam, Alexander, author
Sage Publishing, 2001
Buku Teks
Porter, Lyman W.
McGraw-Hill Kogakusha, 1975
Buku Teks