Randall S.Schuler, Susan E.Jackson, editor
Blackwell Publisher, 2000
Buku Teks
Ficker, Victor B.
Charles E. Merrill, 1975
Buku Teks
Chruden, Herbert J.
South-Western, 1966
Buku Teks
Torpey, William G.,
D.Van Nostrand, 1953
Buku Teks
Asch, David, author
Crest Publishing House, 1999
Buku Referensi