edited by Dorwin Cartwright, Alvin Zander
Harper & Row , 1968
Buku Teks SO
edited by Gove Hambidge ; foreword by Teodoro Moscosco, introd. by Paul G. Hoffman
Frederick A. Praeger, 1964
Buku Teks
Pitt, David C.
Pergamon Press, 1976
Buku Teks
Bellows, Roger
Prentice-Hall, 1962
Buku Teks SO
Wood, James L.
Wadsworth, 1982
Buku Teks SO