Burns, Arthur Edward
Harcourt, Brace, 1948
Buku Teks
Hogendorn, Jan S.
Prentice-Hall, 1995
Buku Teks
Chang, Semoon
Allyn and Bacon, 1990
Buku Teks
Isaacs, Asher, 1902-1963
Dryden Press, 1952
Buku Teks
Abbott, Lawrence
Harcourt, Brace and World, 1967
Buku Teks