Fry, Maxwell J., author
John Hopkins University Press, 1995
Buku Teks
Carre, Jean Jacques, author
Stanford University Press, 1975
Buku Teks
Lundberg, Erik, author
Yale University Press, 1968
Buku Teks
Adelman, Irma, author
Stanford University Press, 1961
Buku Teks
edited by Hugh G.J. Aitken
Social Science Reserch Council, 1959
Buku Teks