Schubert, Glendon A., Jr, author
University of Minnesota Press, 1956
Buku Teks
Corwin, Edward S., author
New York University Press, 1956
Buku Teks
Rossiter, Clinton, 1917-1970, author
The American Library, 1960
Buku Teks
Longaker, Richard P.
Cornell University Press, 1962
Buku Teks
Scigliano, Robert
The Free Press, 1971
Buku Teks