Book excerpt: Digital Reference Services provides an overview of electronic reference services and software, and explores the opportunities that real-time digital reference services can offer in a variety of library settings. Experts in the field offer numerous reports and theory about the evolution of this new approach to answering reference questions. This well-referenced volume contains case examples, figures, useful Web sites, and case histories to show how the basic principles of digital reference services work. Librarians and students of information and library science will find this book helpful to enhance their library and electronic reference expertise.