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.