According to
edufind.com,
Quote:
Ordinary (or common) nouns that end in s, both singular and plural, show possession simply by adding an ' after the s but proper nouns (names of people, cities, countries etc.) can form the possessive either by adding the 's or simply adding the ':
* a. The Hughes' home (or the Hughes's home), Mr Jones's shop (or Mr Jones' shop), Charles' book (or Charles's book)
* b. the ladies' tennis club, the teachers' journal, the priests' church (note that the priest's church would only be refering to one priest while the priests' church refers to a group.)
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According to
GrammarBook.com:
Quote:
Rule: To show singular possession for a word ending in an s or s sound, use the apostrophe and another s.
Examples: the class’s opinion (one class), a bass’s stripes, Marx’s theories, Dickens’s novels
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Hope that clears up any confusion! Makes it clear as mud to me!