Mangone, Gerard J.
Syracuse University Press, 1962
Buku Teks
Randall, Clarence B.
The University of Chicago Press, 1954
Buku Teks
Chandler Publishing Company, 1961
Buku Teks
Washington Government Printing Office, 1955
Buku Teks
Brown Seyom
Columbia University Press , 1983
Buku Teks