APA (7th ed.) Citation

Campbell, G. (1968). Programed learning in mechanical drawing: An experiment to determine the effect of presenting programed units of selected elements of orthographic projection on the ability of pupils to visualize spatial relations. [publisher not identified].

Chicago Style (17th ed.) Citation

Campbell, Gordon. Programed Learning in Mechanical Drawing: An Experiment to Determine the Effect of Presenting Programed Units of Selected Elements of Orthographic Projection on the Ability of Pupils to Visualize Spatial Relations. [Place of publication not identified]: [publisher not identified], 1968.

MLA (9th ed.) Citation

Campbell, Gordon. Programed Learning in Mechanical Drawing: An Experiment to Determine the Effect of Presenting Programed Units of Selected Elements of Orthographic Projection on the Ability of Pupils to Visualize Spatial Relations. [publisher not identified], 1968.