Houghton Miffiln, 1993
Buku Referensi
Anderson, R. G., author
Macdonald & Evans, 1982
Buku Referensi
Wyatt, Allen L.
McGraw-Hill, 1990
Buku Referensi
Dyson, Peter, author
SYBEX, 1994
Buku Referensi
Campbell, Alastair, author
Chronicle Books, 2000
Buku Referensi