Levin, D. R. (1954). Parking meters: A study of their number, revenue and use ; presented at the thirty-second annual meeting, January 13-16, 1953. Highway Research Board.

Levin, David Richard. Parking Meters: A Study of Their Number, Revenue and Use ; Presented at the Thirty-second Annual Meeting, January 13-16, 1953. Washington, D.C: Highway Research Board, 1954.

Levin, David Richard. Parking Meters: A Study of Their Number, Revenue and Use ; Presented at the Thirty-second Annual Meeting, January 13-16, 1953. Highway Research Board, 1954.