APA-referens (7:e uppl.)

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-referens (17:e uppl.)

ebrary, Inc, Ingrid Hehmeyer, Anne Regourd, och Hannelore Schönig. Herbal Medicine in Yemen: Traditional Knowledge and Practice, and Their Value for Today's World. Leiden ; Boston: Brill, 2012.

MLA-referens (9:e uppl.)

ebrary, Inc, et al. Herbal Medicine in Yemen: Traditional Knowledge and Practice, and Their Value for Today's World. Brill, 2012.