Citazione Stile APA (7a Edizione)

Gropper, G. L., & Glasgow, Z. (1971). Criteria for the selection and use of visuals in instruction: A handbook. Educational Technology.

Citazione stile Chigago Style (17a edizione)

Gropper, George L., e Zita Glasgow. Criteria for the Selection and Use of Visuals in Instruction: A Handbook. Englewood Cliffs, NJ: Educational Technology, 1971.

Citatione MLA (9a ed.)

Gropper, George L., e Zita Glasgow. Criteria for the Selection and Use of Visuals in Instruction: A Handbook. Educational Technology, 1971.