Rossiter, Clinton, 1917-1970, author
The American Library, 1960
Buku Teks
Pious, Richard M
Basic Books, 1944
Buku Teks
Mervin, David, author
Longman, 1990
Buku Teks
Corwin, Edward S., author
New York University Press, 1956
Buku Teks
Schubert, Glendon A., Jr, author
University of Minnesota Press, 1956
Buku Teks