Runners entitled to advance on over-the-fence home run

[UmpireErnie]

Apparently this is an editorial annomoly in both NFHS and ASA. I can't find in either book where the runners on base at the time are entitled to advance when the batter-runners batted ball leaves the park for a home run.

NFHS 8-4-3-g and ASA 8-5-H both state that a ball hit over the fence or that hits the foul pole will entitle the batter runner to a "home run". Neither code gives a definition of a "home run" and neither code actually speaks to the runners on base at the time being awarded home!

I mean I KNOW the runners advance home...but I can't prove it in the book.