Taffinder, Paul, author
Crest publishing, 1999
Buku Referensi
Bolt, Gordon, author
Crest publishing, 1999
Buku Referensi
Singh, U.K., author
Anmol Publications, 1998
Buku Referensi
Singh, U.K., author
Anmol Publications, 1998
Buku Referensi
Johannsen, Hano, author
Crest Publishing House, 1999
Buku Referensi