Ford, Andrew
Island Press, 1999
Buku Teks
Floyd, Rita, author
Cambridge University Press, 2010
eBooks
Schwartz, Mortimer D., author
Gale Research, 1977
Buku Teks
Thomas D.Brock, Michael T. Madigan
Pearson Benjamin Cummings, 2009
Buku Teks
Madigan, Michael T., 1949-, author
Pearson Education Limited, 2015
Buku Teks