Pierre, Andrew J., author
Princeton University Press, 1982
Buku Teks
Robin, Ranger, author
Gage, 1979
Buku Teks
edited by Roman Kolkowicz and Neil Joeck
Westview Press, 1984
Buku Teks
New York University Press, 1979
Buku Teks
Edward, David V., author
Holt, Rinehart and Winston, 1969
Buku Teks