APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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