The following three Guides convert page numbers of the Selby‑Bigge/Nidditch editions of Hume's Treatise, Abstract, and Enquiries into the universal references established by the new Oxford University Press editions of them. The Guides, prepared by David and Mary Norton, were published in the November 2003 issue of Hume Studies. Those for the Treatise and Abstract will be included in all future printings, beginning with that now in press, of the OPT edition, and in the forthcoming Clarendon Edition (the critical edition), of these two works.