How do I use a quote that contains two authors words at once (MLA citation)?

How do I use a quote that contains two authors words at once (MLA citation)?The following is from a book by Bill McKibben:
"Some of the first germline interventions might well be semi-medical, aimed at eliminating what Silver calls 'predispositions' toward conditions like obesity."

I want to quote the phrase "predispositions toward conditions like obesity." How should I format the inline citation so that it is clear that part of the phrase is Silver's words and the rest is McKibben's words?

Marissa
""Some of the first germline interventions might well be semi-medical, aimed at eliminating what Silver calls 'predispositions toward conditions like obesity.'"

Quotes around the quoted text.

Yorae
The simplest way to do this is to quote the passage as you have it, pointing out the as Silver says part and for your in text citation to just cite the McKibben book. Anyone who checks your references (assuming they're done properly) will be able to tell that this is you quoting McKibben quoting Silver. It might also be less confusing to just paraphrase or to say something like "as Silver is quoted in Name of Book...." Be sure that whichever way you do it you use McKibben as your citation author since he's the source.

Know better? Leave your own answer in the comments! Discover the facts about obesity , including its most common causes, the effects on health and steps you can take to lose weight.  Your Online Source for Credible Health Information.

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