From Ars Technica. Seems that even the conservative MLA sees the writing on the wall. No longer are books the standard for making a bibliography entry. Now you have to say which kind of media. Also, other arguments about how to quote a web page.
The changes are part of MLA’s seventh edition of the Handbook, published last month, whose predictably soporific cover design belies the radical citation changes within. As Inside Higher Ed describes the changes, “print is the default no more” and the new edition suggests “that the medium of publication should be included in each works cited entry.”