APA (7th ed.) Citation

Changnon, S. A. (1987). Detecting drought conditions in Illinois. Illinois State Water Survey.

Chicago Style (17th ed.) Citation

Changnon, Stanley A. Detecting Drought Conditions in Illinois. Champaign (2204 Griffith Dr., Champaign 61820): Illinois State Water Survey, 1987.

MLA (9th ed.) Citation

Changnon, Stanley A. Detecting Drought Conditions in Illinois. Illinois State Water Survey, 1987.