Name	Info	Provider	Link
Caffeine	free resource	MedlinePlus Health Information	https://medlineplus.gov/caffeine.html
	subscription/membership/fee required	Wiley	https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0009-9236&date=1982&volume=32&issue=2&spage=261