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