Where can I find information on the family Phascolarctidae and genus Phascolarctos?

I'm writing a paper and I need information on the family Phascolarctidae and genus Phascolarctos. I can't find very much information on that family and genus. I need to write atleast three fourths of a page on each of those. Where can I find information on them? (Preferably reliable sources on the Internet.) Thank you.