Cheremisinoff, Nicholas P.
M. Dekker, 1996
Buku Referensi
Adams, Francis V.
McGraw-Hill, 2007
Buku Teks
compiled and edited by Samuel E. Krug
Metritech, 1993
Buku Referensi
edited by Sandy Dolnick
American Library Association , 1990
Buku Teks
Fischer, Joel
The Free Press, 1994
Buku Teks