APA (7th ed.) Citation

Jacobs, L., Jr. (1970). How to use variable contrast papers (3d ed.). Amphoto.

Chicago Style (17th ed.) Citation

Jacobs, Lou, Jr. How to Use Variable Contrast Papers. 3d ed. New York: Amphoto, 1970.

MLA (9th ed.) Citation

Jacobs, Lou, Jr. How to Use Variable Contrast Papers. 3d ed. Amphoto, 1970.