APA (7th ed.) Citation

Heywood, V. H., Brummitt, R. K., Culham, A., & Seberg, O. (2007). Flowering plant families of the world. Firefly Books.

Chicago Style (17th ed.) Citation

Heywood, Vernon Hilton, R. K. Brummitt, A. Culham, and O. Seberg. Flowering Plant Families of the World. New York, USA: Firefly Books, 2007.

MLA (9th ed.) Citation

Heywood, Vernon Hilton, et al. Flowering Plant Families of the World. Firefly Books, 2007.