APA (7th ed.) Citation

Walker, W. O. (1992). Drug control policy: Essays in historical and comparative perspective. Pennsylvania State Univ. Pr.

Chicago Style (17th ed.) Citation

Walker, William O. Drug Control Policy: Essays in Historical and Comparative Perspective. University Park, Pa: Pennsylvania State Univ. Pr, 1992.

MLA (8th ed.) Citation

Walker, William O. Drug Control Policy: Essays in Historical and Comparative Perspective. Pennsylvania State Univ. Pr, 1992.