APA (7th ed.) Citation

Mallery, M. S., & DeVore, R. E. (1982). A sign system for libraries. American Library Association.

Chicago Style (17th ed.) Citation

Mallery, Mary S., and Ralph E. DeVore. A Sign System for Libraries. United States: American Library Association, 1982.

MLA (9th ed.) Citation

Mallery, Mary S., and Ralph E. DeVore. A Sign System for Libraries. American Library Association, 1982.