APA (7th ed.) Citation

Blackaby, L., Georgakas, D., & Margolis, B. (1980). In focus: A guide to using films. New York Zoetrope.

Chicago Style (17th ed.) Citation

Blackaby, Linda, Dan Georgakas, and Barbara Margolis. In Focus: A Guide to Using Films. [New York?]: New York Zoetrope, 1980.

MLA (9th ed.) Citation

Blackaby, Linda, et al. In Focus: A Guide to Using Films. New York Zoetrope, 1980.