A comprehensive reference guide designed to assist researchers, students, and professionals in locating and evaluating information sources. First published in the mid-1990s, this French-language resource has been updated through multiple editions to reflect evolving research practices and available tools. It covers strategies for effective information retrieval, critical evaluation of sources, and navigation of both traditional and emerging information systems. The guide is particularly valued in academic and professional settings for its practical approach to information literacy and its systematic organization of research methodologies.