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