Ehrlich, Paul R., author
Macmillan, 1987
Buku Teks
Price, Peter W., author
John Wiley & Sons, 1984
Buku Teks
Citton, Yves, author
Polity Press, 2017
Buku Teks
edited by Maggie Toy
Academy Editions, 1997
Buku Teks
Weaver, John E., author
McGraw-Hill, 1938
Buku Teks