12-02-2006, 05:40 PM
From that Wiki page, further clarification:
When the noun is a normal plural with an added s, no extra s is added in the possessive, so pens’ lids (where there is more than one pen) rather than pens’s lids.
If the plural is not one that is formed by adding s, add an s for the possessive, after the apostrophe: children’s hats, women’s hairdresser, some people’s eyes, some peoples’ recent emergence into nationhood (peoples being the plural of the singular people, here). These principles are universally accepted.
When the noun is a normal plural with an added s, no extra s is added in the possessive, so pens’ lids (where there is more than one pen) rather than pens’s lids.
If the plural is not one that is formed by adding s, add an s for the possessive, after the apostrophe: children’s hats, women’s hairdresser, some people’s eyes, some peoples’ recent emergence into nationhood (peoples being the plural of the singular people, here). These principles are universally accepted.