Sallaberry, Christian, author
Wiley, 2013
Buku Teks
Lancaster, F. Wilfrid, author
John Wiley & Sons, 1979
Buku Teks
Williams, William F., author
Business Press, 1968
Buku Teks
Baeza-Yates, Ricardo, author
Addison-Wesley , 1999
Buku Teks
Megarry, Jacquetta, author
British Broadcasting Corporation, 1985
Buku Teks