The best on-line writing style guide I know of is the one used by the The
Economist:
http://www.economist.com/editorial/freeforall/library/index_styleguide.html
Their advice on possessives is:
Use the normal possessive ending 's after singular words or names that
end in s: boss's, caucus's, Delors's, St James's, Jones's, Shanks's.
Use it after plurals that do not end in s: children's, Frenchmen's,
media's.
Use the ending s' on plurals that end in s---Danes', bosses',
Joneses'---including plural names that take a singular verb, eg,
Reuters', Barclays', Stewarts & Lloyds', Salomon Brothers'.
Although singular in other respects, the United States, the United
Nations, the Philippines, etc, have a plural possessive apostrophe:
eg, Who will be the United States' next president?
Strunk & White is also a good, pocket-sized resource, but so far as I know
there is no up-to-date edition on-line.
Greg
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