The rule for possessives is simple. If it's a singular, add apostrophe s. If it's plural, just add an apostrophe. This is the standard that is used today.
The standard I was taught had an exception to the singular; if the singular already ends in 's', you add an apostrophe, but no extra s. The rule has been standardised to the above to make it easier to use.
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Date: 2006-01-17 06:45 am (UTC)The standard I was taught had an exception to the singular; if the singular already ends in 's', you add an apostrophe, but no extra s. The rule has been standardised to the above to make it easier to use.