APA (7th ed.) Citation

Barkley, A., & Barkley, P. W. (2013). Principles of agricultural economics. Routledge.

Chicago Style (17th ed.) Citation

Barkley, A., and Paul W. Barkley. Principles of Agricultural Economics. Third Avenue, New York: Routledge, 2013.

MLA (9th ed.) Citation

Barkley, A., and Paul W. Barkley. Principles of Agricultural Economics. Routledge, 2013.