APA (7th ed.) Citation

Schoppert, D. W., & Hoyt, D. W. (1968). Factors influencing safety at highway-rail grade crossings. Highway Research Board, National Research Council.

Chicago Style (17th ed.) Citation

Schoppert, David W., and Dan W. Hoyt. Factors Influencing Safety at Highway-rail Grade Crossings. [Washington]: Highway Research Board, National Research Council, 1968.

MLA (8th ed.) Citation

Schoppert, David W., and Dan W. Hoyt. Factors Influencing Safety at Highway-rail Grade Crossings. Highway Research Board, National Research Council, 1968.