Lehrer, Robert N., author
Prentice-Hall, 1959
Buku Teks
Lehrer, Robert N., author
Prentice-Hall, 1975
Buku Teks
edited by H.S.D. Cole ... [et. al.]
Chatto & Windus for Sussex University Press, 1973
Buku Teks
McGraw-Hill, 1993
Buku Teks
Pfeffer, Jeffrey
Harvard Business School Press, 2007
Buku Teks