APA (7th ed.) Citation

Smith, T. G., & Oppenlander, J. C. (1968). Economic model for the maintenance of traffic signals. Purdue University.

Chicago Style (17th ed.) Citation

Smith, Thorold G., and J. C. Oppenlander. Economic Model for the Maintenance of Traffic Signals. Lafayette, Ind.: Purdue University, 1968.

MLA (9th ed.) Citation

Smith, Thorold G., and J. C. Oppenlander. Economic Model for the Maintenance of Traffic Signals. Purdue University, 1968.