1. . Melissa L. In Flora Europaea, Vol. 3, , , , , , (eds). Cambridge University Press, Cambridge, 1972; 162.
2. . The Plant Book, 2nd edn. Cambridge University Press, Cambridge, 1997.
3. . The Complete German Commission E Monographs Therapeutic guide to Herbal Medicines. American Botanical Council, Austin, TX, 1998.
4. Plants used in phytotherapy, cosmetics and dyeing in the pramanda district (epirus, north-west greece)