^Hanson JR. Natural Products: the Secondary Metabolite. Cambridge: Royal Society of Chemistry. 2003. ISBN 0-85404-490-6. Natural products are organic compounds that are formed by living systems.
^Natural Products. Stedman's Medical Dictionary. Lippincott Williams & Wilkins. (原始内容存档于2016-08-03) (英语). Natural products: naturally occurring compounds that are end products of secondary metabolism; often, they are unique compounds for particular organisms or classes of organisms.
^Williams DA, Lemke TL. Chapter 1: Natural Products. Foye's Principles of Medicinal Chemistry 5th. Philadelphia: Lippincott Williams Wilkins. 2002: 25 [2017-08-04]. ISBN 0-683-30737-1. (原始内容存档于2016-05-03). Natural product: A single chemical compound that occurs naturally. This term is typically used to refer to an organic compound of limited distribution in nature (often called secondary metabolites).
^ 7.07.1Li JW, Vederas JC. Drug discovery and natural products: end of an era or an endless frontier?. Science. July 2009, 325 (5937): 161–5. PMID 19589993. doi:10.1126/science.1168243(英语).