Daniel Gregory Mason Papers 1894-1953 - Summary of manuscript holdings at Columbia University. - http://www.columbia.edu/cu/libraries/inside/projects/findingaids/scans/pdfs/31_MAM-MER_13.pdf
Mason, Daniel Gregory - Brief biography noting studies and move from writing about music to writing music from the Grove Concise Dictionary of Music at WQXR radio. - http://www.wqxr.com/cgi-bin/iowa/cla/learning/grove.html?record=5816