APA

Helm B., Free J., Warner C. & Frandsen G. (1976). Scale-model evaluation of frictional effects and redirection mechanisms for angle barrier impacts. : Transportation Research Record nr 566.

Chicago

Helm BR, Free JC, Warner CY and Frandsen GB. 1976. Scale-model evaluation of frictional effects and redirection mechanisms for angle barrier impacts. : Transportation Research Record nr 566.

Harvard

Helm B., Free J., Warner C. and Frandsen G. (1976). Scale-model evaluation of frictional effects and redirection mechanisms for angle barrier impacts. : Transportation Research Record nr 566.

MLA

Helm BR, Free JC, Warner CY and Frandsen GB. Scale-model evaluation of frictional effects and redirection mechanisms for angle barrier impacts. : Transportation Research Record nr 566. 1976.