APA (7th ed.) Citation

Cox, P. A., & Cox, K. N. E. (1990). Cox's guide to choosing rhododendrons. Timber Press.

Chicago Style (17th ed.) Citation

Cox, Peter A., and Kenneth N. E. Cox. Cox's Guide to Choosing Rhododendrons. Portland, Or.: Timber Press, 1990.

MLA (9th ed.) Citation

Cox, Peter A., and Kenneth N. E. Cox. Cox's Guide to Choosing Rhododendrons. Timber Press, 1990.