APA
Duke J. A., Duke J. A., . (2002). Handbook of medicinal herbs. London: CRC.
Chicago
Duke James A, Duke James A, . 2002. Handbook of medicinal herbs. London: CRC.
Harvard
Duke J. A., Duke J. A., . (2002). Handbook of medicinal herbs. London: CRC.
MLA
Duke James A, Duke James A, . Handbook of medicinal herbs. London: CRC. 2002.