Sources that are themselves the primary philosophical or historical material under discussion: a philosopher's own published work, correspondence, an official transcript or press release documenting a first-hand event, or a translated excerpt of an original text. Belongs here: any source that is the primary object of study rather than commentary upon it, including original correspondence, official announcements and documentary translations as well as published philosophical works. Does not belong here: a secondary scholarly discussion of a primary text, grouped under Secondary Scholarship, or a reference-work summary of one, grouped under one of the encyclopedia categories.