APA

Castells M., Portes A. & Benton L. A. (1989). The Informal economy. Baltimore, Md: Johns Hopkins University Press.

Chicago

Castells Manuel, Portes Alejandro and Benton Lauren A. 1989. The Informal economy. Baltimore, Md: Johns Hopkins University Press.

Harvard

Castells M., Portes A. and Benton L. A. (1989). The Informal economy. Baltimore, Md: Johns Hopkins University Press.

MLA

Castells Manuel, Portes Alejandro and Benton Lauren A. The Informal economy. Baltimore, Md: Johns Hopkins University Press. 1989.