Rheingold, H. (Ed.). (2014). The peeragogy handbook. Jointly published by Pierce Press and PubDomEd.
The Peeragogy Handbook isn't a normal book. It is an evolving guide, and it tells a collaboratively written story that you can also help write. It is a living document, and the team behind it release a new version every year as they improve the material. The latest version is available on peeragogy.org and the source is at git.io/Handbook . You can comment on each page in the online edition. And you can also talk directly with the contributors and connect with others who are interested in applying peeragogy in the Peeragogy in Action community. There is a print edition, which lets you do some things that the web doesn't. From a design point of view, this is a resource to mine for new ideas.