APA (7th ed.) Citation

Wolverton, B. C. (1997). How to grow fresh air: 50 houseplants that purify your home or office. Penguin Books.

Chicago Style (17th ed.) Citation

Wolverton, B. C. How to Grow Fresh Air: 50 Houseplants That Purify Your Home or Office. New York: Penguin Books, 1997.

MLA (8th ed.) Citation

Wolverton, B. C. How to Grow Fresh Air: 50 Houseplants That Purify Your Home or Office. Penguin Books, 1997.

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