Schuman, Frederick L., author
Whittlesey House, 1931
Buku Teks
edited by Youngnok Koo and Sung-joo Han
Columbia University Press, 1985
Buku Teks
Cohen, Bernard Cecil, 1926-, author
Princeton University Press, 1957
Buku Teks
Lippmann, Walter, author
Little, Brown, 1943.
Buku Teks
Joseph, Phillip, author
George Allen and Unwin, 1928
Buku Teks