Encyclopedia of computer science
edited by Anthony Ralston and Edwin D. Reilly ; managing editor, Caryl Ann Dahlin
Van Nostrand Reinhold, 1993
 Buku Referensi
Jordan, Philip B.
Condensed computer encyclopedia
McGraw-Hill, 1969
 Buku Referensi
Encyclopedia of science, technology and ethics
Thompson Gale, 2005
 Buku Teks
International encyclopedia of political science
SAGE Reference, 2011
 Buku Referensi
The social science encyclopedia
edited by Adam Kuper and Jessica Kuper
Routledge, 1996
 Buku Referensi