Joyce, James Avery, author
Sijthoff and Noordhoff, 1978
Buku Teks
D`anieri, Paul J., 1965-, author
Cengage Learning, 2017
Buku Teks
Praeger , 1981
Buku Teks
Princeton University Press, 1944
Buku Teks
Taylor, Phillip M., author
Routledge, 1997
Buku Teks