APA

Palen J. J., . (2001). Social Problems for the Twenty-first Century. [Boston]: McGraw-Hill Companies.

Chicago

Palen J John, . 2001. Social Problems for the Twenty-first Century. [Boston]: McGraw-Hill Companies.

Harvard

Palen J. J., . (2001). Social Problems for the Twenty-first Century. [Boston]: McGraw-Hill Companies.

MLA

Palen J John, . Social Problems for the Twenty-first Century. [Boston]: McGraw-Hill Companies. 2001.