APA (7th ed.) Citation

University of Illinois at Urbana-Champaign. Cooperative Extension Service. (1980). Typical R values. Cooperative Extension Service, University of Illinois.

Chicago Style (17th ed.) Citation

University of Illinois at Urbana-Champaign. Cooperative Extension Service. Typical R Values. [Urbana]: Cooperative Extension Service, University of Illinois, 1980.

MLA (9th ed.) Citation

University of Illinois at Urbana-Champaign. Cooperative Extension Service. Typical R Values. Cooperative Extension Service, University of Illinois, 1980.