Johannsen, Hano, author
Crest Publishing House, 1999
Buku Referensi
edited by M.D. Jitendra
Anmol Publications, 1999
Buku Referensi
Ho, Samuel K., author
Crest publishing, 1999
Buku Referensi
Thorne, Kaye, author
Crest publishing, 1999
Buku Referensi
Seekings, David, author
Crest publishing, 1999
Buku Referensi