Raven, Peter H., author
Worth Publisher, 1986
Buku Referensi
Kaufman, Peter B.; Carlson, Thomas F.; Dayanandan, P.; Evans, Michael L.; Fisher, Jack B.; Parks, Clifford; Wells, James R.
Harper & Row, 1989
Buku Referensi
Raven, Peter H., author
Worth Publishers, 1992
Buku Teks
Laetsch, Watson M., author
Little, Brown, 1979
Buku Teks
Corner, E.J.H.
The World Publishing Company, 1964
Buku Teks