APA (7th ed.) Citation

Hay, R., Elbert, G., & Davies, R. (1977). Practical gardening encyclopedia. Van Nostrand Reinhold Co..

Chicago Style (17th ed.) Citation

Hay, Roy, George Elbert, and Roger Davies. Practical Gardening Encyclopedia. New York: Van Nostrand Reinhold Co., 1977.

MLA (9th ed.) Citation

Hay, Roy, et al. Practical Gardening Encyclopedia. Van Nostrand Reinhold Co., 1977.