British Pharmacopoeia Commission & Stationery Office (Great Britain). (2015). British pharmacopoeia 2016. Stationery Office.
Edwards, S. E. (n.d.). Phytopharmacy: An Evidence-Based Guide to Herbal Medical Products. http://dx.doi.org/10.1002/9781118543436
European Scientific Cooperative on Phytotherapy. (1999). E/S/C/O/P monographs: the scientific foundation for herbal medicinal products (2nd ed., completely rev. and expanded). E/S/C/O/P.
Heinrich, M. (2012). Fundamentals of pharmacognosy and phytotherapy (2nd ed). Churchill Livingstone/Elsevier.
Heinrich, M. (2015). Quality and safety of herbal medical products: regulation and the need for quality assurance along the value chains. British Journal of Clinical Pharmacology, 80(1), 62–66. https://doi.org/10.1111/bcp.12586
Karsch-Völk, M., Barrett, B., Kiefer, D., Bauer, R., Ardjomand-Woelkart, K., & Linde, K. (1996). Echinacea for preventing and treating the common cold. In Cochrane Database of Systematic Reviews. John Wiley & Sons, Ltd. https://doi.org/10.1002/14651858.CD000530.pub3
Kayne, S. B. (2009). Complementary and alternative medicine. Pharmaceutical Press. https://ebookcentral.proquest.com/lib/ucl/detail.action?docID=411097
Lockwood, B., & Rapport, L. (2007). Nutraceuticals: a guide for healthcare professionals (Second edition). Pharmaceutical Press. https://ebookcentral.proquest.com/lib/ucl/detail.action?docID=363949
Medicines and Healthcare products Regulatory Agency - GOV.UK. (n.d.). https://www.gov.uk/government/organisations/medicines-and-healthcare-products-regulatory-agency
MedicinesComplete. (n.d.). https://www.medicinescomplete.com/mc/
Prance, G. T., & Nesbitt, M. (2005). The cultural history of plants. Routledge. https://www.dawsonera.com/guard/protected/dawson.jsp?name=https://shib-idp.ucl.ac.uk/shibboleth&dest=http://www.dawsonera.com/depp/reader/protected/external/AbstractView/S9780203020906
Stockley’s herbal medicines interactions: a guide to the interactions of herbal medicines (2nd ed). (2013a). Pharmaceutical Press. http://www.medicinescomplete.com/mc/shmi/current/
Stockley’s herbal medicines interactions: a guide to the interactions of herbal medicines (2nd ed). (2013b). Pharmaceutical Press. http://www.medicinescomplete.com/mc/shmi/current/
Veitch, N. C., Smith, M., & Baxter, I. A. (2013). Herbal medicines (4th ed). Pharmaceutical Press.
Wichtl, M., Brinckmann, J., & Lindenmaier, M. P. (2004). Herbal drugs and phytopharmaceuticals: a handbook for practice on a scientific basis (3rd ed). Medpharm.
Williamson, E. M. (2002). Major herbs of Ayurveda. Churchill Livingstone.
Witt, C. M. (2013). Clinical research on traditional drugs and food items—the potential of comparative effectiveness research for interdisciplinary research. Journal of Ethnopharmacology, 147(1), 254–258. https://doi.org/10.1016/j.jep.2013.02.024