Thanks, Diogenesister and Terry, for your replies.
Good philosophy, Terry! When I first began editing (you were one of my first "clients"), I was less aware than I am now. Rewriting, with an aim towards simplicity, can eliminate complex structures that demand extraordinary punctuation. I, for one, now tend towards clarity and simplicity. Not so in my youthful prolixity.
Diogenesister:
Perusing books and periodicals in my country (USA), I have found that, virtually without exception, periods and commas always fall within the close of both single and double quotation marks. Question and exclamation marks may be within or without (outside) the close of quotation marks; it depends whether the question or exclamation is, or is not, part of the quotation.