Kennan, George F., 1904-, author
Princeton University Press , 1954
Buku Teks
Wesson, Robert G., author
Houghton Miffiln, 1977
Buku Teks
edited by Ernest K. Lindley
Beacon Press, 1963
Buku Teks
by Martin Agronsky ... [et.al.]
Simon and Schuster, 1961
Buku Teks
Strober, Gerald S., author
Harper Perennial, 1994
Buku Teks