APA (7th ed.) Citation

Steenbergh, W. F., & Lowe, C. H. (1977). Ecology of the saguaro. National Park Service.

Chicago Style (17th ed.) Citation

Steenbergh, Warren F., and Charles H. Lowe. Ecology of the Saguaro. Washington, D.C.: National Park Service, 1977.

MLA (9th ed.) Citation

Steenbergh, Warren F., and Charles H. Lowe. Ecology of the Saguaro. National Park Service, 1977.