Re:Perhaps in 1955... (Score 1)

For quite a while now, both the xs' and xs's forms have been taught in beginner and college english, and both are in widespread use.

My understanding is that it depends on the plurality of the word. Jobs is singular, so you add the apostrophe and the s, e.g., Jobs's ire. However, take developers. That is plural, so you drop the s, e.g., developers' ire.