Jason Puckett. Zotero: A Guide for Librarians, Researchers and Educators. Chicago: American Library Association, 2011.
Jason Puckett is the the Communication Librarian at Georgia State University Library in Atlanta, where he teaches library classes on research and information literacy skills, bibliographic software, and library technology topics.
If you don’t want to buy a personal copy, at least request that your library (school or public) add it to their collection. It’s readable and well-organized.