Cuthbertson, Keith
The University of Michigan, 1992
Buku Teks
edited by Paul Newbold and Stephen J. Leybourne
Elgar Reference Collection, 2003
Buku Teks
Johnston, J.
McGraw-Hill , 1972
Buku Teks
Brown, T. Merritt, author
Macmillan, 1970
Buku Teks
I Gusti Ngurah Agung, author
John Wiley & Sons, 2009
Buku Teks