I'm looking at you, Chicago.
MLA eschews URLs in an update for this wild new “information age” of ours:
The seventh edition of the MLA Handbook for Writers of Research Papers, released Tuesday, states that the Modern Language Association no longer recognizes print as the default medium, and suggests that the medium of publication should be included in each works cited entry.
"Style: MLA, Updated." Inside Higher Ed, via Ars
Hint hint, friends.