Ryerson University's Learning and Teaching Office in Ontario, Canada is an excellent source of information on teaching adult learners and teaching in general. I have included links to two adult learning specific examples below. Go to their website to access all of the information they provide.
Teachers College at Columbia University and their Community College Research Center (CCRC) is also an excellent source of research on community colleges and their contribution to adult education. Samples are below. Go to their website to access all of the information they provide.