APA (7th ed.) Citation

Gardiner, J. A. (1969). Traffic and the police: Variations in law-enforcement policy. Harvard University Press.

Chicago Style (17th ed.) Citation

Gardiner, John A. Traffic and the Police: Variations in Law-enforcement Policy. Cambridge: Harvard University Press, 1969.

MLA (9th ed.) Citation

Gardiner, John A. Traffic and the Police: Variations in Law-enforcement Policy. Harvard University Press, 1969.