Quiggin, A. Hingston
Methuen , 1949
Buku Teks
Einzig, Paul
Eyre & Spottiswood , 1949
Buku Teks
edited by Martin Tucker
Ungar, 1988
Buku Referensi
Diamond, A. S. (Arthur Sigismund), author
Johnson`s, 1950
Buku Teks
Boas, Franz, 1858-1942, author
Dover Publication, 1955
Buku Teks