Strunk & White is full of all sorts of crap so I've mostly stopped viewing them as a decent source, but like was said way up above, no matter what position you take on the rules of s-ending possessive nouns you'll probably be able to find some source that agrees with you.
So again, no matter how it is done someone important will think you're doing it wrong. So just pick a method that you're comfortable with and be consistent.
Personally I think the the possessive apostrophe is (and the contraction apostrophe) are unnecessary grammatically so let me be the first to advocate that you make a bold linguo-political statement and just not use them at all.
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