Barber, Alfred W., author
Parker Publishing Company, Inc., 1980
Buku Referensi
edited by P.J. Gelling and H.J.M. Bouwmeester
CRC Press, 1997
Buku Referensi
Wang, Franklin F.Y., author
North-Holland, 1980
Buku Teks
edited by Peter G. Bruce
Cambridge University Press, 1997
Buku Teks
edited by A.K. Cheetham and Peter Day
Clarendon Press, 1992
Buku Teks