This bibliography with 1,273 entries is an updated supplement to the preliminary 1997 bibliography on informal adult learning. It is a useful resource guide for those interested in publications (e.g. academic papers, government reports, grassroots publications) aimed at furthering understanding of how learning and teaching takes place in different settings (specifically, informal and non-formal environments). The guide also lists resources that address how the different ways that learning and teaching exist in various learning environments can be valued and supported. Introductory materials include bibliography sources and search terms. Entries are grouped into these seven categories: (1) general (overviews, definitions and conceptual distinctions, theories of learning, conceptual factors/histories, research methods and standpoint of researchers); (2) surveys/ethnographies; (3) learning power and action in resisting communities; transitions between learning and work (youth, higher education, seniors, learning and work mismatches); (4) learning in the workplace (general; corporations, management, professionals; workers; other work sites); (5) union-based learning; (6) informal learning and technology; and (7) prior learning assessment and recognition. (YLB)