Do you allow one or multiple references? If multiple, then do this: $page->ref_page->first()->title; or then foreach then. If only one is allowed, then set it single page object from field settings and earlier example should work.
Probably not all correct anymore, but basics are true: http://processwire.com/talk/topic/545-progress-on-processwire-22-and-overview-of-multi-language-support/page__st__40__p__5732#entry5732 It should help you get started. If not, feel free to ask help.
This:
$page->ref_page;
doesn't return the id, it returns the whole page object (echoes the id though, but var_dumb shows the truth). So no need to get(id), because you already have the correct page. This is what you are looking for:
$page->ref_page->title;
EDIT: And if you do need the id, it can be get with this:
$page->ref_page->id;