Wright, David McCord, 1909-, author
Macmillan, 1955
Buku Teks
Hogendorn, Jan S., author
Prentice-Hall, 1995
Buku Teks
Burns, Arthur Edward, author
Harcourt, Brace, 1948
Buku Teks
Chang, Semoon, author
Allyn and Bacon, 1990
Buku Teks
Abbott, Lawrence, author
Harcourt, Brace and World, 1967
Buku Teks