Pincus, Gregory, author
Academic, 1965
Buku Teks
Hawthorn, Geoffrey, author
Collier MacMillan, 1970
Buku Teks
McFalls, Joseph A., author
Academic Press, 1984
Buku Teks
Feith, Herbert
Cornell University Press, 1968
Buku Teks
McConnell, Grant, author
Atheneum, 1969
Buku Teks