APA (7th ed.) Citation

Duff, J. M., & Ross, W. A. (1995). Freehand sketching for engineering design. PWS Publishing.

Chicago Style (17th ed.) Citation

Duff, Jon M., and William A. Ross. Freehand Sketching for Engineering Design. Boston, Mass: PWS Publishing, 1995.

MLA (9th ed.) Citation

Duff, Jon M., and William A. Ross. Freehand Sketching for Engineering Design. PWS Publishing, 1995.