Prentice-Hall, 1970
Buku Teks
Adkins, Dorothy C., author
Charles E. Merrill Books , 1964
Buku Teks
Barnet, Sylvan, author
Batsford Academic and Educational, 1985
Buku Teks
Barnet, Sylvan, author
Little, Brown, 1979
Buku Teks
edited by Norman MacKenzie
The New American Library, 1968
Buku Teks