APA (7th ed.) Citation

Houtman, R. (2004). Variegated trees and shrubs: The illustrated encyclopedia. Timber Press.

Chicago Style (17th ed.) Citation

Houtman, Ronald. Variegated Trees and Shrubs: The Illustrated Encyclopedia. Portland Or: Timber Press, 2004.

MLA (9th ed.) Citation

Houtman, Ronald. Variegated Trees and Shrubs: The Illustrated Encyclopedia. Timber Press, 2004.

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