APA (7th ed.) Citation

Downing, E. R. (1919). A source book of biological nature-study. The University of Chicago press.

Chicago Style (17th ed.) Citation

Downing, Elliot Rowland. A Source Book of Biological Nature-study. Chicago, Ill.: The University of Chicago press, 1919.

MLA (9th ed.) Citation

Downing, Elliot Rowland. A Source Book of Biological Nature-study. The University of Chicago press, 1919.

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