Williams, William F.
Business Press, 1968
Buku Teks
Lancaster, F. Wilfrid
John Wiley & Sons, 1979
Buku Teks
Baeza-Yates, Ricardo
Addison-Wesley , 1999
Buku Teks
Baeza-Yates, Ricardo
Addison-Wesley, 2011
Buku Teks
Alexander Sapto Utomo Putro
2014
UI - Skripsi (Membership)