This document outlines different types of information sources, including published works such as government publications, journals, newspapers, monographs, reference works, audiovisual media, and electronic media. It also discusses unpublished works like human sources, dissertations, theses, reports, grey literature, information on the internet, and email. For each type of information source, one or two examples are typically provided. The document concludes by mentioning secondary information sources like bibliographies and indexes that can be used to retrieve information, and encourages library training.