Davis, Elisabeth B.
Marcel Dekker, 1981
Buku Referensi
edited by John M. Lawler and Helen Aristar Dry
Routledge, 1998
Buku Teks
Taylor, James, author
IBM- Press, 2012
Buku Teks
Desfray, Philippe, author
Morgan Kaufmann, 2014
eBooks
Bremness, Lesley, author
Dorling Kindersley, 1988
Buku Teks