Bailey, Kenneth D., author
The free press, 1994
Buku Teks
Forcese, Dennis P., author
Prentice-Hall, 1973
Buku Teks
Morison, Murray
Longman, 1993
Buku Teks
Nadel, S.F. (Siegfried Frederick), author
Cohen & West, 1969
Buku Teks
edited by, Jan J. Loubser ...[et al.].
The Free Press, 1976
Buku Teks