APA (7th ed.) Citation

Rockford Map Publishers. (1980). Illinois State atlas (Rev. 1980.). Rockford Map Publishers.

Chicago Style (17th ed.) Citation

Rockford Map Publishers. Illinois State Atlas. Rev. 1980. Rockford, Ill.: Rockford Map Publishers, 1980.

MLA (9th ed.) Citation

Rockford Map Publishers. Illinois State Atlas. Rev. 1980. Rockford Map Publishers, 1980.

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