Hi Carlos, I don't, maybe you have looked, but this book is in pdf: Amphibian Medicine and captive husbandry. I'm reading it right now.
Thanks for tip Bonasa ; but appears it's still protected by copyright laws in the US . Did find couple torrent type websites with file; but those required additional downloads and installing programs that are security risks for my laptop .
Remember to take care of the enclosure and it will take care of your frog !