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I just checked my copy of MLA Handbook and I find no guidance on this case. The only example it gives has a single name. (I'll readily yield to someone who can point out that I missed something.) G...
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#3: Attribution notice added
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#2: Initial revision
I just checked my copy of MLA Handbook and I find no guidance on this case. The only example it gives has a single name. (I'll readily yield to someone who can point out that I missed something.) Given that, I'd just say, "Do something sensible." It's conventional in other instances, like footnotes, to separate names with commas, so that's what I'd do. Of course if your instructor has given specific guidance, or if your school has a style sheet, I'd follow that.