APA (7th ed.) Citation

Ackery, P. R., & Vane-Wright, R. I. (1984). Milkweed butterflies. British Museum (Natural History).

Chicago Style (17th ed.) Citation

Ackery, P. R., and R. I. Vane-Wright. Milkweed Butterflies. London: British Museum (Natural History), 1984.

MLA (9th ed.) Citation

Ackery, P. R., and R. I. Vane-Wright. Milkweed Butterflies. British Museum (Natural History), 1984.