APA (7th ed.) Citation

Emerson, F. V., & Emerson, H. L. (1920). Agricultural geology. John Wiley & sons, inc.; [etc., etc.].

Chicago Style (17th ed.) Citation

Emerson, Frederick V., and H. L. Emerson. Agricultural Geology. New York: John Wiley & sons, inc.; [etc., etc.], 1920.

MLA (9th ed.) Citation

Emerson, Frederick V., and H. L. Emerson. Agricultural Geology. John Wiley & sons, inc.; [etc., etc.], 1920.