ebrary, Inc, Hehmeyer, I., Regourd, A., & Schönig, H. (2012). Herbal medicine in Yemen: Traditional knowledge and practice, and their value for today's world. Brill.
Chicago-viite (17. p.)ebrary, Inc, Ingrid Hehmeyer, Anne Regourd, ja Hannelore Schönig. Herbal Medicine in Yemen: Traditional Knowledge and Practice, and Their Value for Today's World. Leiden ; Boston: Brill, 2012.
MLA-viite (9. p.)ebrary, Inc, et al. Herbal Medicine in Yemen: Traditional Knowledge and Practice, and Their Value for Today's World. Brill, 2012.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.