APA

Automotive Safety Foundation, . (1968). Traffic Control & Roadway Elements - Their relationships to highway safety. Chapter 1-12. Washington DC: Automotive Safety Foundation.

Chicago

Automotive Safety Foundation, . 1968. Traffic Control & Roadway Elements - Their relationships to highway safety. Chapter 1-12. Washington DC: Automotive Safety Foundation.

Harvard

Automotive Safety Foundation, . (1968). Traffic Control & Roadway Elements - Their relationships to highway safety. Chapter 1-12. Washington DC: Automotive Safety Foundation.

MLA

Automotive Safety Foundation, . Traffic Control & Roadway Elements - Their relationships to highway safety. Chapter 1-12. Washington DC: Automotive Safety Foundation. 1968.