APA (7th ed.) Citation

Killingback, S., & Haggerty, V. (1990). Tulips: An illustrated identifier and guide to cultivation. The Apple Press.

Chicago Style (17th ed.) Citation

Killingback, Stanley, and Vana Haggerty. Tulips: An Illustrated Identifier and Guide to Cultivation. London: The Apple Press, 1990.

MLA (9th ed.) Citation

Killingback, Stanley, and Vana Haggerty. Tulips: An Illustrated Identifier and Guide to Cultivation. The Apple Press, 1990.

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