1
by Syed Amin Aljeffri
Published 1998
2
by Stern
Published 1993
3
by Janenko
Published 2002
4
by Khoo, Kheng-Hor
Published 2001
5
by Yoffie
Published 2001
6
7
by Madura
Published 2001
8
by Sekaran, Uma
Published 1992