Briggs, Leslie J.
Englewood Cliffs , 1981
Buku Teks
SAGE publications, 2010
Buku Teks
Bergstra, Jan A., author
Atlantis Press, 2012
eBooks
Kelley, David S.
McGraw-Hill, 2001
Multimedia
Dickinson, Leslie, author
Cambridge University Press , 1987
Buku Teks