When you write a plural abbreviation (example: M.D.s) do you leave out the apostrophe? - Quora
Apostrophe S – Possessive Nouns – Grammar Charts | Woodward English
grammatical number - Do plural forms of acronyms based on English loan words end in 's'? - German Language Stack Exchange
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Apostrophe S - Possessive Nouns in English - YouTube
EnglishCentral on Instagram: "Form the plural of an acronym or other abbreviation simply by adding an "s" at the end. Do not add an apostrophe (") as it's used for possession. #EnglishCentral #
How to Make a Last Name Plural or Possessive - Rules & Examples
Apostrophe S – Possessive Nouns | Woodward English