O`Connell, D. P., author
Stevens & Sons Limited, 1970
Buku Teks
edited by Beth A. Simmons and Richard H. Steinberg
Cambridge University Press, 2006
Buku Teks
Shaw, Malcolm Nathan, 1947-, author
Cambridge University Press, 2017
Buku Teks
Fenwick, Charles G., author
Appleton-Century-Crofts, 1948
Buku Teks
Schwarzenberger, Georg, author
Stevens & Sons, 1949
Buku Teks