Armitage, Angus
Mentor Books, 1952
Buku Teks
Armitge, Angus
The New American Library, 1956
Buku Teks
edited by Dagobert D. Runes
Littlefield, Adams & Co., 1959
Buku Referensi
edited by F.S.C. Northrop
Yale University Press, 1949
Buku Teks
Christensen, Kit R., author
McGraw-Hill, 2002
Buku Teks