Is there some writing style guide under which you add an apostrophe when you make a plural of a number, or is there an error in the title of that book? Honest question from someone deeply entrenched in APA style.
Not that I'm aware of. I tend to shy away from it, but decided to quote the title verbatim as Seyi gave his book. He did spend a good bit of time in the UK, so maybe it's a British English thing?
Interesting. It definitely seems like there is a lot of variability. I would have never guessed about the AP rule regarding single numbers but not multiple digit numbers.
Is there some writing style guide under which you add an apostrophe when you make a plural of a number, or is there an error in the title of that book? Honest question from someone deeply entrenched in APA style.
Not that I'm aware of. I tend to shy away from it, but decided to quote the title verbatim as Seyi gave his book. He did spend a good bit of time in the UK, so maybe it's a British English thing?
More on it here: https://english.stackexchange.com/questions/55970/plurals-of-acronyms-letters-numbers-use-an-apostrophe-or-not
Interesting. It definitely seems like there is a lot of variability. I would have never guessed about the AP rule regarding single numbers but not multiple digit numbers.