APA (7th ed.) Citation

Hejal, S. S., Yoder, S. R., & Oppenlander, J. C. (1969). Optimal design of flexible pavement sections. Purdue University.

Chicago Style (17th ed.) Citation

Hejal, Salim Said, S. R. Yoder, and Joseph C. Oppenlander. Optimal Design of Flexible Pavement Sections. Lafayette: Purdue University, 1969.

MLA (9th ed.) Citation

Hejal, Salim Said, et al. Optimal Design of Flexible Pavement Sections. Purdue University, 1969.