APA (7th ed.) Citation

Purnell, W. F., & Walker, E. D. (1950). Handling northeastern Illinois soils. Univ. of Ill.

Chicago Style (17th ed.) Citation

Purnell, W. F., and Ernest D. Walker. Handling Northeastern Illinois Soils. Urbana: Univ. of Ill, 1950.

MLA (9th ed.) Citation

Purnell, W. F., and Ernest D. Walker. Handling Northeastern Illinois Soils. Univ. of Ill, 1950.

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