APA (7th ed.) Citation

(1977). U.S. postal zip code directory. Grosset & Dunlap.

Chicago Style (17th ed.) Citation

U.S. Postal Zip Code Directory. New York: Grosset & Dunlap, 1977.

MLA (9th ed.) Citation

U.S. Postal Zip Code Directory. Grosset & Dunlap, 1977.