Board Thread:The Panopticon/@comment-4139960-20130125140323/@comment-188432-20130125142205

ABHFTD is called a short story because that's what the Puffin press release called them.

I haven't researched the others, but they can't go un-disambiguated. It's not really a matter of number of pages, but what the publisher calls them. If they're called novella or novel then the dab term is (novel). If they're actually called short story, then they're (short story).