Schrieke, Bertram Johannes Otto, author
W. Van Hoeve, 1959
Buku Teks
Henslin, James M., author
Erlangga, 2007
Buku Teks
Edgar F. Borgatta, editor-in-chief, Marie L. Borgatta, managing editor
Macmillan, 1992
Buku Referensi
editor, Frank N. Magill
Salem Press, 1994
Buku Referensi
Horton, Paul B., author
Erlangga, 1990
Buku Teks