APA (7th ed.) Citation

Holm, E. (1979). The biology of flowers. Penguin Books.

Chicago Style (17th ed.) Citation

Holm, Eigil. The Biology of Flowers. Harmondsworth, Middlesex: Penguin Books, 1979.

MLA (9th ed.) Citation

Holm, Eigil. The Biology of Flowers. Penguin Books, 1979.

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