Citazione Stile APA (7a Edizione)

Witheford, D. K. (1970). Speed enforcement policies and practice. Eno Foundation for Transportation.

Citazione stile Chigago Style (17a edizione)

Witheford, David K. Speed Enforcement Policies and Practice. Saugatuck, Conn: Eno Foundation for Transportation, 1970.

Citatione MLA (9a ed.)

Witheford, David K. Speed Enforcement Policies and Practice. Eno Foundation for Transportation, 1970.