Crest Publishing House, 1998,
Buku Referensi
Larousse, 2005
Buku Referensi
Association for Computing Machinery
Association for Computing Machinery, 2003
eBooks
Maurin, Louis
Belin, 2007
Buku Teks
Harrsen, Meta, author
Library of Congress, 1949
Buku Referensi