Cita APA (7th ed.)
Mohlenbrock, R. H., & Voigt, J. W. (1974). A flora of southern Illinois. Southern Illinois University Press.
Cita Chicago (17th ed.)
Mohlenbrock, Robert H., i John W. Voigt. A Flora of Southern Illinois. Carbondale: Southern Illinois University Press, 1974.
Cita MLA (9th ed.)
Mohlenbrock, Robert H., i John W. Voigt. A Flora of Southern Illinois. Southern Illinois University Press, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.