Maddex, Robert L.
Routledge, 1996
Buku Teks
New York University Press, 1951
Buku Teks
D. J. Galligan.(Denis James), 1947-, editor
Oxford University Press, 2014
Buku Teks
Gibson, William M., author
Duke University Press, 1948
Buku Teks
Schwartz, Bernard, author
New York University Press, 1956
Buku Teks