APA
National Roads Board. Road Research Unit, . (1967). New Zealand roading symposium 1967. Proceedings. Wellington, NZ: National Roads Board. Road Research Unit.
Chicago
National Roads Board. Road Research Unit, . 1967. New Zealand roading symposium 1967. Proceedings. Wellington, NZ: National Roads Board. Road Research Unit.
Harvard
National Roads Board. Road Research Unit, . (1967). New Zealand roading symposium 1967. Proceedings. Wellington, NZ: National Roads Board. Road Research Unit.
MLA
National Roads Board. Road Research Unit, . New Zealand roading symposium 1967. Proceedings. Wellington, NZ: National Roads Board. Road Research Unit. 1967.