Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=31332809.ui
	subscription/membership/fee required	Wiley	https://doi.org/10.1111/ced.14037
	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/ced/article-lookup/doi/10.1111/ced.14037
	free resource	Spiral, Imperial College Digital Repository	http://hdl.handle.net/10044/1/72075