Hurt, R. Douglas, author
Garland Publishing, 1994
Buku Referensi
Wolf, Eric R.
V. Klostermann, 1950
Buku Teks
Stromberg, Roland D.
Appleton-Century-Crofts, 1968
Buku Teks
Wolf, Rijk de
Van Wijnen, 1992
Buku Teks
Goldman, Alvin I., author
MIT Press, 1993
Buku Teks