APA (7th ed.) Citation

Voigt, J. W., & Mohlenbrock, R. H. (1964). Plant communities of Southern Illinois. Southern Illinois University Press.

Chicago Style (17th ed.) Citation

Voigt, John W., and Robert H. Mohlenbrock. Plant Communities of Southern Illinois. Carbondale: Southern Illinois University Press, 1964.

MLA (8th ed.) Citation

Voigt, John W., and Robert H. Mohlenbrock. Plant Communities of Southern Illinois. Southern Illinois University Press, 1964.