APA (7th ed.) Citation

Royal Horticultural Society (Great Britain) & Hay, R. (1974). The dictionary of house plants. McGraw-Hill.

Chicago Style (17th ed.) Citation

Royal Horticultural Society (Great Britain) and Roy Hay. The Dictionary of House Plants. New York: McGraw-Hill, 1974.

MLA (9th ed.) Citation

Royal Horticultural Society (Great Britain) and Roy Hay. The Dictionary of House Plants. McGraw-Hill, 1974.