The SAGE Encyclopedia of social science research methods
Sage Publications, 2007
 eBooks
International encyclopedia of the social sciences : social science quotation, volume 19
David L. Sills, Robert K. Merton, editors
MacMilan Publishing, 1991
 Buku Referensi
Encyclopedia of computer science
edited by Anthony Ralston and Edwin D. Reilly ; managing editor, Caryl Ann Dahlin
Van Nostrand Reinhold, 1993
 Buku Referensi
Encyclopedia of science and technology Vol.1
editor, in.chief, R.P. Jain; editors, V.K. Gendhi, Artul Amand, Anuj Kohli, Anil Sharga
Crest Publishing House, 1998,
 Buku Referensi
Encyclopedia of science and technology Vol.2
Crest Publishing House, 1998,
 Buku Referensi