APA (7th ed.) Citation

Perry, F., & Hay, R. (1982). Tropical and subtropical plants: How to recognise them. Ward Lock.

Chicago Style (17th ed.) Citation

Perry, Frances, and Roy Hay. Tropical and Subtropical Plants: How to Recognise Them. London: Ward Lock, 1982.

MLA (9th ed.) Citation

Perry, Frances, and Roy Hay. Tropical and Subtropical Plants: How to Recognise Them. Ward Lock, 1982.

Warning: These citations may not always be 100% accurate.