British Pharmacopoeia Commission and Stationery Office (Great Britain). British Pharmacopoeia 2016. London: Stationery Office, 2015. Print.
Edwards, Sarah E. Phytopharmacy: An Evidence-Based Guide to Herbal Medical Products. N.p. Web. <http://dx.doi.org/10.1002/9781118543436>.
European Scientific Cooperative on Phytotherapy. E/S/C/O/P Monographs: The Scientific Foundation for Herbal Medicinal Products. 2nd ed., completely rev. and expanded. Exeter ; Stuttgart: E/S/C/O/P, 1999. Print.
Heinrich, Michael. Fundamentals of Pharmacognosy and Phytotherapy. 2nd ed. Edinburgh: Churchill Livingstone/Elsevier, 2012. Print.
---. ‘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 (2015): 62–66. Web.
Karsch-Völk, Marlies et al. ‘Echinacea for Preventing and Treating the Common Cold’. Cochrane Database of Systematic Reviews. Chichester, UK: John Wiley & Sons, Ltd, 1996. Web. <http://doi.wiley.com/10.1002/14651858.CD000530.pub3>.
Kayne, Steven B. Complementary and Alternative Medicine. London: Pharmaceutical Press, 2009. Web. <https://ebookcentral.proquest.com/lib/ucl/detail.action?docID=411097>.
Lockwood, Brian, and Lisa Rapport. Nutraceuticals: A Guide for Healthcare Professionals. Second edition. London: Pharmaceutical Press, 2007. Web. <https://ebookcentral.proquest.com/lib/ucl/detail.action?docID=363949>.
‘Medicines and Healthcare Products Regulatory Agency - GOV.UK’. N.p., n.d. Web. <https://www.gov.uk/government/organisations/medicines-and-healthcare-products-regulatory-agency>.
‘MedicinesComplete’. N.p., n.d. Web. <https://www.medicinescomplete.com/mc/>.
Prance, Ghillean T., and Mark Nesbitt. The Cultural History of Plants. New York: Routledge, 2005. Web. <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. London: Pharmaceutical Press, 2013. Web. <http://www.medicinescomplete.com/mc/shmi/current/>.
---. 2nd ed. London: Pharmaceutical Press, 2013. Web. <http://www.medicinescomplete.com/mc/shmi/current/>.
Veitch, Nigel C., Michael Smith, and Ian A. Baxter. Herbal Medicines. 4th ed. London: Pharmaceutical Press, 2013. Print.
Wichtl, Max, Josef Brinckmann, and Michael P. Lindenmaier. Herbal Drugs and Phytopharmaceuticals: A Handbook for Practice on a Scientific Basis. 3rd ed. Stuttgart ; Boca Raton: Medpharm, 2004. Print.
Williamson, Elizabeth M. Major Herbs of Ayurveda. London: Churchill Livingstone, 2002. Print.
Witt, Claudia M. ‘Clinical Research on Traditional Drugs and Food Items—the Potential of Comparative Effectiveness Research for Interdisciplinary Research’. Journal of Ethnopharmacology 147.1 (2013): 254–258. Web.