Holcombe, Arthur N.
Harvard University Press, 1940
Buku Teks
edited by, Alan D. Burnett and Peter J. Taylor
John Wiley & Sons, 1981
Buku Teks
Macmillan, 1965
Buku Teks
Brown, Harrison
The Viking Press , 1963
Buku Teks
New York Oxford University Press 1970,
Buku Teks