Gaya APA

Ernest, G. (1949). The Essential oils .Volume 3 : Individual Essential oils of the plant families rutaceae and labiatae . New York: Robert E.Krieger.

Gaya MLA

Ernest, Guenther. "The Essential oils .Volume 3 : Individual Essential oils of the plant families rutaceae and labiatae". New York: Robert E.Krieger, 1949. Text.