London, Oxford University Press
Buku Referensi
Scott,foresman and company, 1990
Buku Teks
edited by Berelson, Bernard
American Library Association, 1949
Buku Teks
compiled and arranged on an English alphabetical basis by W. E. Clason
Elsevier, 1978
Buku Referensi
Patricia May Bantug Jurilla, author
Nakanishi Printing Company, 2023
Artikel Jurnal