This document defines grey literature as information produced by government, academics, business, and industry that is not controlled by commercial publishers. It is typically found in electronic and print formats. The document lists common types of grey literature such as government documents, theses, reports, and conference papers. It provides sources for finding grey literature, including government websites, libraries, and scholarly search engines. It also offers tips for critically evaluating grey literature, such as checking dates, statements of responsibility, and assessing bias.