Burns, Arthur Edward, author
Harcourt, Brace, 1948
Buku Teks
Hogendorn, Jan S., author
Prentice-Hall, 1995
Buku Teks
Chang, Semoon, author
Allyn and Bacon, 1990
Buku Teks
Wright, David McCord, 1909-, author
Macmillan, 1955
Buku Teks
Isaacs, Asher, 1902-1963, author
Dryden Press, 1952
Buku Teks