Hi, This matter is often called "Apostrophe Catastrophe". I said "catastrophe" because in such a case, there's no unambiguous answer that I can refer you to. There are two main disciplines covering this issue.
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PterThe author used the possessive form Jobs's.Right. Many style manuals recommend adding 's to all singulars even if they end in s.
Pterif the word is singular, whether the word ends in s or not is irrelevent, and apostrophe s is always used. Is my understanding correct?Yes.
PterThen, how should I pronounce Jobs's? Like Jobs or Jobses?Like Jobses.