APA (7th ed.) Citation

Guenther, E., & Althausen, D. (1953). The essential oils (2. print.). Van Nostrand.

Chicago Style (17th ed.) Citation

Guenther, Ernest, and Darrell Althausen. The Essential Oils. 2. print. New York [u.a.]: Van Nostrand, 1953.

MLA (9th ed.) Citation

Guenther, Ernest, and Darrell Althausen. The Essential Oils. 2. print. Van Nostrand, 1953.