An older book from your library would be better. Like Bicycling Magazine's Complete Guide to Maintenance and Repair or some version of Sloan's Complete Book of Bicycling. A newer book would also do, but considering it's an older bicycle there'll be a lot of stuff in a newer book that really won't help—just get in the way. Checking out a book will cost you nothing.

Since I'm sort of a Retro-Grouch, the books at my library have taught me most of what I need to know. I'll buy a newer book when and if I decide to buy a newer bicycle.