edited by Dagobert D. Runes
Littlefield, Adams & Co., 1959
Buku Referensi
Thomas, Henry
Blakiston, 1946
Buku Teks
Christensen, Kit R.
McGraw-Hill, 2002
Buku Teks
Goldman, Alvin I.
MIT Press, 1993
Buku Teks
Losee, John
Oxford University Press, 1980
Buku Teks