Παραπομπή APA

Guenther, E. (1948). The essential oils. D. Van Nostrand Co..

Παραπομπή Chicago Style

Guenther, Ernest. The Essential Oils. New York: D. Van Nostrand Co., 1948.

Παραπομπή MLA

Guenther, Ernest. The Essential Oils. D. Van Nostrand Co., 1948.