english: [nq:1]My general guideline (and that of many people) for adding the possessive apostrophe s to words that end in an 's' or 'z' sound is to add the 's only if you pronounce it as a syllable. [/nq] As you are about to make clear, the problem with this rule is that it is difficult to be self-consistent and much more difficult for two or more writers or editors to agree on which names use the extra syllable. For this reason editorial guidelines generally are one or the other of: 1) Add 's to all singular nouns or proper names (except for a fewBiblical or classical names) 2) Add only the ' when the noun or name ends in s - always.
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