The MHRA Style Guide Online
A Handbook for Authors and Editors • Third Edition
From Chapter 11, 'References'
References (in the body of the text or in notes) should document the information offered, to allow the reader to check the source of a quotation or the evidence on which an argument is based. A reference must therefore enable the reader to find the source referred to as quickly and easily as possible.
A work of literature should be quoted or referred to in a satisfactory scholarly edition. If a literary or critical work is published both in the UK and overseas, the UK edition should be used unless there are special reasons for doing otherwise. If an edition other than the first is used, this should be stated. If an unrevised reprint is used (such as a modern facsimile reprint of an out-of-print work or a paperback reissue of an earlier book), the publication details of the original edition as well as of the reprint should be given. Details of original publication should also be provided where an article from a journal is reprinted in an anthology of criticism (see 11.2.3): a reader looking for the article in a library is often more likely to find the original journal than the anthology. In referring to works of literature of which several editions may be available, it is often helpful to give the reader more information than merely the page number of the edition used:
p. 235 (Book iii, Chapter 4)
Similarly, when quoting a letter from a collection, it may be helpful to cite the date as well as the page number:
p. 281 (23 April 1864)
Full references to well-known works (OED, DNB, etc.) are normally unnecessary, though for encyclopedias and biographical dictionaries of multiple authorship it is often relevant to name the writer of the article cited.