"Dawkins'" or "Dawkins's" [duplicate]

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When did it become correct to add an 's' to a singular possessive already ending in 's'?

I learned from school to use Dawkins', for example

That is Mr. Dawkins' house.

But I see many people write Dawkins's instead. Is it something related to American English as opposed to British conventions?

Surely this is a duplicate of several questions on this site already... — ShreevatsaR, Commented Jan 3, 2011 at 8:14
@ShreevatsaR, it does seem familiar. How would one search for this sort of thing? — Brian Hooper, Commented Jan 3, 2011 at 9:15
Duplicates: What is the correct possessive for nouns ending in s?, When did it become correct to add an 's' to a singular possessive already ending in 's'?. (Found through the "Related" bar on the right.) — ShreevatsaR, Commented Jan 3, 2011 at 9:24

Peter Eisentraut · Accepted Answer · 2011-01-03 07:35:49Z

3

Both forms are valid, depending on the style guide you follow. It does not appear to be a regional thing. Wikipedia has an overview.

answered Jan 3, 2011 at 7:35

Peter Eisentraut

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