I actually looked this up a little while ago, and apparently both are acceptable, though s's is thought of as being more grammatically correct. I don't recall seeing s's until I lived in the UK, so take that as you will.
Also, when looking it up, it was mentioned more than once that ancient names didn't need the extra 's', nor did names with more than one syllable. *sigh* All these rules!!
Okay, now wait. I just found this on a message board:
According to The Chicago Manual of Style and Strunk and White's Elements of Style, you make a possessive out of common nouns ending in "s" by adding an apostrophe, regardless of whether they're singluar or plural. You should write: ships' sails, workers' rights.
In most cases, you make a possessive out of proper nouns (such as people's names) by adding an apostrophe and an "s." You Should write: Bridget Jones's diary, Prince Charles's haircut. The additional "s" should be pronounced ("Charl-zez").
According to the Chicago Manual of Style, the only exceptions are the names Jesus, Moses, and certain multisyllabic ancient Greek names, such as Aristopheses. It is permissiable to say "Jesus' words" or "Socrates' teachings."
Ha! Bridget Jones's is always how I remember this (version of the) rule. It was something I always struggled with because it looks so strange, but now I give all proper names eneding in S the s's.
Also, when looking it up, it was mentioned more than once that ancient names didn't need the extra 's', nor did names with more than one syllable. *sigh* All these rules!!
Okay, now wait. I just found this on a message board:
According to The Chicago Manual of Style and Strunk and White's Elements of Style, you make a possessive out of common nouns ending in "s" by adding an apostrophe, regardless of whether they're singluar or plural. You should write: ships' sails, workers' rights.
In most cases, you make a possessive out of proper nouns (such as people's names) by adding an apostrophe and an "s." You Should write: Bridget Jones's diary, Prince Charles's haircut. The additional "s" should be pronounced ("Charl-zez").
According to the Chicago Manual of Style, the only exceptions are the names Jesus, Moses, and certain multisyllabic ancient Greek names, such as Aristopheses. It is permissiable to say "Jesus' words" or "Socrates' teachings."
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