Citazione Stile APA (7a Edizione)

(1972). The changeable-message concept of traffic control: Report of a conference held July 15-16, 1971. Highway Research Board, National Research Council.

Citazione stile Chigago Style (17a edizione)

The Changeable-message Concept of Traffic Control: Report of a Conference Held July 15-16, 1971. Washington, D.C: Highway Research Board, National Research Council, 1972.

Citatione MLA (9a ed.)

The Changeable-message Concept of Traffic Control: Report of a Conference Held July 15-16, 1971. Highway Research Board, National Research Council, 1972.