"The possessive of singular nouns is formed by the addition of an apostrophe and an s, and the possessive of plural nouns by the addition of an apostrophe only. The general rule for the possessive of nouns covers most proper nouns, including most names ending in sibilants (a definite "es" or "ez" sound):
- Dickens's novels
- Ross's land"
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Exception Number One
"Another widely used technique is to write the word as we would speak it. For example, since most people saying, "Mr. Hastings' pen" would not pronounce an added s, we would write Mr. Hastings' pen with no added s. But most people would pronounce an added s in "Jones's," so we'd write it as we say it: Mr. Jones's golf clubs. This method explains the punctuation of for goodness' sake."
You wouldn't say Angel Editses. You would just say Angel Edits.
Exception Number Two
"If [a polysyllabic personal name] ends with a z sound, treat it like a plural; if it ends with an s sound, treat it like a singular:
- Dickens', Hopkins', Williams'
- Harris's, Thomas's, Callas's"
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- Les's car
- Travis's bike
Exception Number Three
"Consistency is the key here: if you choose not to add the -s after a noun that already ends in s, do so consistently throughout your text."
So, as long as I'm consistent, I'm gold.