APA (7th ed.) Citation

Heywood, V. H. (2007). Flowering plant families of the world. Firefly Books.

Chicago Style (17th ed.) Citation

Heywood, V. H. Flowering Plant Families of the World. Richmond Hill, Ont.: Firefly Books, 2007.

MLA (9th ed.) Citation

Heywood, V. H. Flowering Plant Families of the World. Firefly Books, 2007.