Schwartz, Bernard, author
Clarendon Press Oxford, 1972
Buku Teks
Mints, Lloyd W., author
University of Chicago Press, 1956
Buku Teks
Farnsworth, E. Allan, author
Oceana Publication, 1983
Buku Teks
Currie, Lauchlin, author
Russell and Russell, 1968
Buku Teks
Kitzinger, Uwe W., author
Frederick A. Praeger, 1963
Buku Teks