APA (7th ed.) Citation

Layfield, R. E., & Parry, D. I. (1998). Traffic calming: Speed cushion schemes. Transport Research Laboratory.

Chicago Style (17th ed.) Citation

Layfield, R. E., and D. I. Parry. Traffic Calming: Speed Cushion Schemes. Crowthorne, Berkshire: Transport Research Laboratory, 1998.

MLA (9th ed.) Citation

Layfield, R. E., and D. I. Parry. Traffic Calming: Speed Cushion Schemes. Transport Research Laboratory, 1998.