Gaya APA

Collier, P. (2007). The bottom billion: Why the poorest countries are failling and what can be done about it. . New York: New York Oxford University Press.

Gaya MLA

Collier, Paul. "The bottom billion: Why the poorest countries are failling and what can be done about it. ". New York: New York Oxford University Press, 2007. Buku.