Is it acceptable to list both a DOI and a URL in the same works-cited-list entry if one leads to a chapter and the other to the book as a whole?
No. If you are citing a chapter of a book from a novel or monograph, create an entry for the book as a whole and list the book’s URL or DOI in the “Location” slot, since in MLA style, chapters from these types of works are not cited individually:
Gerrard, Christine. Aaron Hill: The Muses’ Projector, 1685-1750. Oxford UP, Jan. 2010, doi:10.1093/acprof:oso/9780198183884.001.0001.
If you are citing a chapter from an anthology, create an entry for the chapter and list the chapter URL or DOI:
Lewalski, Barbara K. “Paradise Lost, the Bible, and Biblical Epic.” The Oxford Handbook of the Bible in Early Modern England,
Published 3 April 2019