Am I right that the plural of an acronym gets an apostrophe ess ('s)? (There’s a case of beer involved here so a reference would be appreciated). I am seeing both with and without in the media but I swear I was taught in my copy editing course that acronyms get the apostrophe. “FAQ’s” rather than “FAQs” for example. Perhaps there is a similar rule to the “a/an” rule where you use “an FAQ” if you say “eff ay cue” but “a FAQ” if you say “fack.”
Related issue: Is there a good grammer reference on the web? I looked for Strunk and White but just got an offer to buy the book. BTW, I ordered it, since I can’t find my old one (otherwise I believe I would have settled the argument before it escalated into a bet).