Gaya APA

tyler, V, E., Robbers, J, E. (1999). Tyler's Herbs of Choice: the Therapeutic Use of Phytomedicinals . New York: The Haworth Herbal Press.

Gaya MLA

tyler, Varro, E.., Robbers, James, E.. "Tyler's Herbs of Choice: the Therapeutic Use of Phytomedicinals". New York: The Haworth Herbal Press, 1999. Text.