APA (7th ed.) Citation

Koller, E. L. (1940). Cover designing. International correspondence schools.

Chicago Style (17th ed.) Citation

Koller, Edmund Leonard. Cover Designing. Scranton, Pa: International correspondence schools, 1940.

MLA (9th ed.) Citation

Koller, Edmund Leonard. Cover Designing. International correspondence schools, 1940.

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