APA (7th ed.) Citation

Heywood, V. H., & Gray, L. (2011). Flowering plants: A pictorial guide to the world's flora. Firefly Books.

Chicago Style (17th ed.) Citation

Heywood, V. H., and Leon Gray. Flowering Plants: A Pictorial Guide to the World's Flora. Buffalo, N.Y.: Firefly Books, 2011.

MLA (9th ed.) Citation

Heywood, V. H., and Leon Gray. Flowering Plants: A Pictorial Guide to the World's Flora. Firefly Books, 2011.