Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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