Siddiqui, Iqtidar Husain, author
Munshiram Manoharlal , 1992
Buku Teks
Wiggins, Gary, 1943-, author
McGraw-Hill, 1991
Buku Teks
edited by C.P. Ager
Bowker-Saur, 1992
Buku Referensi
editors, L.T. Morton, S. Godbolt
Butterworth, 1984
Buku Referensi
Ching-Chih, Chen, author
MIT Press, 1977
Buku Teks