APA (7th ed.) Citation

Smith, D. L., Bertrand, C. A., Cleland, S. M., Harrell, R. L., & Hawkins, L. V. (1969). An experimental comparison of programmed instruction and lecture-demonstration methods of teaching descriptive geometry.

Chicago Style (17th ed.) Citation

Smith, Darrell Lee, Clint A. Bertrand, Samuel M. Cleland, Roger L. Harrell, and Leslie V. Hawkins. An Experimental Comparison of Programmed Instruction and Lecture-demonstration Methods of Teaching Descriptive Geometry. [College Station, Tex.], 1969.

MLA (9th ed.) Citation

Smith, Darrell Lee, et al. An Experimental Comparison of Programmed Instruction and Lecture-demonstration Methods of Teaching Descriptive Geometry. 1969.