Quote:
Originally Posted by LSPoorEeyorick
It's pretty standard grammatical practice. Chris' is pronounced "chrises." Powers' is pronounced "powerses." I can't find a single reliable grammar reference source online that promotes use of s's because of pronunciation.
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As MBC pointed out, Stunk & White (as well as Modern Language Association, Economist, Purdue's Online Writing Lab) indicate that if the "es" is pronounced, it should be written 's. As for supporting sources, since most major sources actually support using 's as the standard case and using s' as the exception based on pronunciation, I'll site some that support said exception:
The Guardian (admittedly a UK source),
Emory,
American Heritage/Bartlby.