APA (7th ed.) Citation

Hammond Incorporated. (1976). Webster's atlas and zip code directory. G. and C. Merriam.

Chicago Style (17th ed.) Citation

Hammond Incorporated. Webster's Atlas and Zip Code Directory. Springfield, Mass: G. and C. Merriam, 1976.

MLA (9th ed.) Citation

Hammond Incorporated. Webster's Atlas and Zip Code Directory. G. and C. Merriam, 1976.