Maxwell-Hudson, Clare, author
Dorling Kindersley, 1988
Buku Referensi
Flast, Robert, author
Berkely, California Osborne McGraw-Hill 1986,
Buku Teks
Harberts, Kurt, author
Frederick A. Preager, 1963,
Buku Teks
Buchman, Dian Dincin, author
NTC Publishing Group,U.S., 2002
Buku Teks
Berman, Alan
FrancesLincoln limited, 1997
Buku Teks