Fox, Alan, author
Colier-Macmillan, 1973
Buku Teks
Parker, S.R., author
George Allen and Unwin , 1975
Buku Teks
Watson, Tony J., author
Routledge, 1995
Buku Teks
Singh, Narendar, 1957-, author
Tata McGraw-Hill, 2012
Buku Teks
edited by Sandra Wallman
Academic Press, 1979
Buku Teks