Fried, Louis, author
Reston Publishing, 1979
Buku Teks
Brandon, Dick H., author
Brandon/System Press, 1970
Buku Teks
Brandon, Dick H., author
Macmillan Information , 1975
Buku Teks
edited by Auerbach Pub. Inc.
Prentice-Hall, 1981
Buku Teks
Gildersleeve, Thomas R., author
Prentice-Hall, 1971
Buku Teks