Christensen, Kit R., author
McGraw-Hill, 2002
Buku Teks
edited by John Herman Randali, Justus Buchler
Barnes & Noble, 1950
Buku Teks
Goldman, Alvin I., author
MIT Press, 1993
Buku Teks
edited by Herbert Morris
Stanford University Press, 1961
Buku Teks
edited by Dagobert D. Runes
Littlefield, Adams & Co., 1959
Buku Referensi