APA (7th ed.) Citation

Guenther, E., & Althausen, D. (1949). The essential oils / by E. Guenther. Van Nostrand.

Chicago Style (17th ed.) Citation

Guenther, Ernest, and Darrell Althausen. The Essential Oils / by E. Guenther. Van Nostrand, 1949.

MLA (9th ed.) Citation

Guenther, Ernest, and Darrell Althausen. The Essential Oils / by E. Guenther. Van Nostrand, 1949.

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