edited by Jerrold R. Brandell
Free Press, 1997
Buku Teks
Rhodhes, Margaret L., author
Routledge and Kegan Paul, 1986
Buku Teks
Trecker, Harleigh B., author
Association Press, 1971
Buku Teks
Praeger Publ., 1983
Buku Teks
Loewenberg, Frank
F.E. Peacock Publishers, Inc, 1988
Buku Teks