Thompson, June M., author
Westview Press, 1990
Buku Teks
Walsh, Warren Bartlett, author
The University of Michigan Press, 1958
Buku Teks
Miller, Wright
E.P. Dutton, 1961
Buku Teks
Bauer, Raymond A., author
Harvard University Press, 1952; 1959
Buku Teks
Daniels, Robert V
Westview Press, 1988
Buku Teks