Bagchi, Biman
Cambridge University Press, 2013
Buku Teks SO
edited by Keith Cameron
Blackwell, 1989
Buku Teks SO
Wei, Jie
McGraw-Hill, 1979
Buku Teks SO
Maria Armenia Carrondo, editor
[Springer, ], 2012
eBooks
Patton, William E.
South-Western, 1992
Buku Teks SO