Downward, Michael, author
Taylor and Francis, 1998
Buku Teks
Russo, Claudio, editor
Springer-Verlag, 2012
eBooks
Farrell, Joyce, author
Course Technology Cengage Learning, 2013
Buku Teks
North Holland, 1988
Buku Teks
editor, Chiaki Sakama
Springer-Verlag, 2012
eBooks