If a page number includes letters in addition to a number, should I include the letters?

Note: This post relates to content in the eighth edition of the MLA Handbook. For up-to-date guidance, see the ninth edition of the MLA Handbook.

Yes. In the following example of a quotation from an early English work, the quotation appears on page 37v, so you would include both the number and the letter in your parenthetical reference:

In “Dumbe Man’s Academie,” John Bulwer writes, “The Dumbe hath the same passions as wee have for he hath the same potentialitye of the soule equal with us” (folio 37v).

Work Cited

Bulwer, John. “The Dumbe Man’s Academie.” British Library, London, MS Sloane 1788.