Robinson, O.F.
Routledge, 1997
Buku Teks
Wiggins, Gary, 1943-
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
MIT Press, 1977
Buku Teks