APA (7th ed.) Citation

Hughes, W., & Hughes, W. E. (2004). Development of a highway safety manual. Transportation Research Board.

Chicago Style (17th ed.) Citation

Hughes, Warren, and Warren Edward Hughes. Development of a Highway Safety Manual. Washington, DC: Transportation Research Board, 2004.

MLA (9th ed.) Citation

Hughes, Warren, and Warren Edward Hughes. Development of a Highway Safety Manual. Transportation Research Board, 2004.