Hardy Boys Reference Books

[MacGyver]

In another thread, I was reminded about the Hardy & Hardy Investigations reference book by Tony Carpentieri and Paul Mular. I thought it would be worthwhile to have a thread talking about the various reference books out there and discussing their usefulness. I know of a few but I would love to have any others I've missed added to this list. For any members who own or have read any of these books, which ones do you think are best?
 
Ghost of The Hardy Boys by Leslie McFarlane
The Secret of the Stratemeyer Syndicate by Carol Billman
The House on the Point by Benjamin Hoff