Inclusion standards

I'm not sure if this was already brought up or not, but should we be including Fantastic Beasts and Where to Find Them, Quidditch Through the Ages and The Tales of Beedle the Bard information here? I have all three of those books and it would be easy for me to start adding info, but I wasn't sure... they are, after all, written directly by J. K. Rowling and were (as far as I can remember) intended to be part of the series, so why not include them in canon? I want to know what everyone else thinks, though.