Millett, John D.
New York, N.Y. Columbia University Press 1956,
Buku Teks
edited by Mary Irwin
American Council on Education, 1956
Buku Teks
Porterfield, John D.
Voice American Forum Lecture, [date of publication not identified]
Buku Teks
Miller, Leonard S.
Carnegic Commision on Higher Education, 1975
Buku Teks
Washington U.S. Department of Health, Education, and Welfare 1955
Buku Teks