Gildersleeve, Thomas R., author
Prentice-Hall, 1971
Buku Teks
Fried, Louis, author
Reston Publishing, 1979
Buku Teks
Spencer, Donald D., author
Charles E. Merrill, 1982
Buku Teks
Cashman, Thomas J., author
Anaheim Publishing, 1970
Buku Teks
Awad, Elias M., author
Prentice-Hall, 1966
Buku Teks