Punctuating Capn' with a comma

[Melinda]

Does anyone know if I'm punctuating this right?

Sergeant Blake trembled. "Capn', I didn't do nuthin'."

It looks weird to put the comma and period outside the apostrophe, but it would be illogical to put it inside. This is dialog in fiction, obviously.

Thanks for any insights!

[Gabi]

Cap'n is Ok by me. A shortened word or words such as do not = don't, not dont'; or have I bypassed some new rules. Again.

As far as I know the apostophe is placed where the letters are missing. Cap[tai]n = Cap[']n

The the placement of the apostrophe in the word nuthin' is correct as the apostrophe replaces the missing letter g.

I'm going cross-eyed, here!

[Ken, Moderator]

Yes, as the apostrophe is part of the word, it goes inside the period or comma which, in the States, goes inside the quotation mark. You do the hokey-pokey and you turn it all around, that's what it's all about!

[Melinda]

Gabi, Oh my gosh, of course it would be Cap'n, not Capn'. Thanks for catching that. I was critiquing someone else's work and obviously didn't do it well enough. :) Newengland, thanks for your corroboration. The work I'm critiquing is actually sort of British, but has so far kept with American punctuation with regards to the period/comma inside the quotation.