http://en.wikipedia.org/wiki/Eric_Gill

There is no apostrophe in "its" when used as a posessive pronoun.
If in doubt, ask yourself whether the text would make sense with the apostrophe replaced by the "i" for which it is substituting.

On the other hand, SaveGirl101 topic "Credit where its due" is also incorrect, as there, the "its" is a contraction of "it is," ain't it?

Yeppers.

Thank you for that correction Nick. I always enjoy learning from your comments at Typophile. Would you be willing to share a few kilobytes in response to my ill crafted question above? I would be very happy if you did.

You might try Just My Type—I haven't read it, but apparently the author is a journalist who focuses on the more sensational aspects of type design.

Thanks Birdseeding, your suggestion exceeded my criteria. Have you any PG-13 recommendations?

I am 27th in line to borrow that book from my library. The earlier post with excerpt "Reviving the Doves Type - 'typocide' and rebirth of a legendary typeface" was so cool.