Bruce, Steve
Oxford University Press, 1996
Buku Teks
Berger, Peter L., author
Anchor Books, 1990
Buku Teks
Hach, Jurgen
Quelle & Meyer , 1980
Buku Teks
Turner, Bryan S., author
Sage, 1983
Buku Teks
Johnstone, Ronald L., author
Prentice-Hall, 1975
Buku Teks