I have been wanting to get the Hostapedia, waiting for them to come down. LOL. I got this one instead (link) It has a lot of information but not as much as I would like, especially concerning dormancy. I would love to know more about what does good in the south, not much information except for Tony Avent's article. He has written other articles about Hostas and I do enjoy reading them. I also like to know the sun tolerance of hostas and pest resistance. I have been using databases to collect my own information there is not actually a book that has all I need to know. I am very happy to research hostas and plant the ones with a high sun tolerance and pest resistance, it allows more time to enjoy the hosta garden instead of doing maintenance and killing slugs. So much for a humid, zone 8 hosta garden.
https://www.amazon.com/dp/0881929603/
I was the butt of many jokes with my giant lap book on the other Hosta Forum. I do have a rope to drag it around with. LOL.