I've got a definitive guide, one I just picked up (Simon & Shuster's Handbook for Writers 7th Edition) and now that you bring this topic up, I'll have to research the answer! I've certainly wondered about this same topic before. By default I would simply place an apostrophe after the S and call it good, but now I want to know why. It's been too many years since the classroom, and I usually snoozed through the classes because I was reading and writing at college level, so I didn't care about the 5th grade lessons. I still got A's, but if questioned on something, I couldn't tell the teacher WHY it was right, just that I knew it was right... LOL (and now it comes back to bite me)
Trying To Sort Out Those Apostrophes...
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http://www.cableforum.co.uk/board/22/36022-use-of-apostrophes.html
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Interesting (?) discussion:
http://www.bbc.co.uk/tyne/content/articles/2008/05/30/st_james_apostrophe_feature.shtml
Does anyone feel they can give a definitive guide to all this ?