Digital Reference Services Bibliography - Bernie Sloan’s excellent bibliography. The more than 700 items listed in this bibliography relate to the topic of online or virtual or digital reference services, i.e., the provision of reference including e-mail, Web forms, chat, video, Web customer call center software, Voice over Internet Protocol (VoIP), etc. Approximately 40% services, involving collaboration between library user and librarian, in a computer-based medium. These services can utilize various media, of the items listed in this bibliography are available via the Web. Links have been provided to direct you to those resources. This has been added to Reference Resources Subject Tracer™ Information Blog.