The first edition of the book was called Asterisk: The Future of Telephony before it became renamed in the 3rd ed. Not sure I’d recommend the first ed as it’s really dated now, but if you insist, you can find all of it’s contents at Asterisk™: The Future of Telephony
It’s going to mention really old stuff that may not be applicable now and you will be unlikely to get any support for them on the forum here. I’m still learning Asterisk and find that a combination of the 5th Edition together with the YouTube learning series from “The VoIP guys” was very helpful in getting me started