APA (7th ed.) Citation

Duff lhJoh M & Ross. Freehand sketching for engineering design.

Chicago Style (17th ed.) Citation

Duff lhJoh M and Ross. Freehand Sketching for Engineering Design. Boston lbPws Publishing Co lc1994.

MLA (9th ed.) Citation

Duff lhJoh M and Ross. Freehand Sketching for Engineering Design.

Warning: These citations may not always be 100% accurate.