World Health Organization. (2011). Quality control methods for herbal materials. World Health Organization.
Cita Chicago (17th ed.)World Health Organization. Quality Control Methods for Herbal Materials. Geneva: World Health Organization, 2011.
Cita MLA (9th ed.)World Health Organization. Quality Control Methods for Herbal Materials. World Health Organization, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.