APA (7th ed.) Citation

Schmidt, R. E., & Campbell, M. E. (1956). Highway traffic estimation. Eno Foundation for Highway Traffic Control.

Chicago Style (17th ed.) Citation

Schmidt, Robert E., and M. Earl Campbell. Highway Traffic Estimation. Saugatuck, Conn.: Eno Foundation for Highway Traffic Control, 1956.

MLA (8th ed.) Citation

Schmidt, Robert E., and M. Earl Campbell. Highway Traffic Estimation. Eno Foundation for Highway Traffic Control, 1956.