Friedrich, Carl J., author
Harvard University, 1958
Buku Teks
Sennet, Richard, author
Alfred A. Knopf, 1980
Buku Teks
Russell, Bertrand, 1872-1970, author
Unwin Paperback, 1977
Buku Teks
Dalton, Gene W., author
MIT Press, 1968
Buku Teks
Muñiz-Fraticelli, Victor Manuel, author
Oxford University Press, 2014
Buku Teks