Harcourt, Brace & World, Inc., 1961
Buku Teks
Triffin, Robert, author
Yale University Press, 1961
Buku Teks
Aubrey, Henry G., author
Frederick A. Praeger, 1964
Buku Teks
Fatemi, Nasrollah S.
Fairleigh Dickinson University Press , 1963
Buku Teks
Hart, Albert Gailord, 1909-, author
Twentieth Century Fund, 1953
Buku Teks