Muhammad Ali Mazidi, author
Prentice-Hall, 1998
Buku Teks
Havelock, Ronald G.
University of Michigan, 1973
Buku Teks
Artikel Jurnal
edited by Jon McCormack, Mark d`Inverno
Springer-Verlag, 2012
eBooks
Lele, R.D., author
Tata McGraw-Hill, 1993
Buku Teks