The current help system, in my opinion, has a serious ambiguity in that it is vague about what constitutes a "source request". This has created confusion and situations where some members are voting to close a question and others are busy writing up answers and urging on the OP. Obviously this creates a mixed message for OPs when some members are saying their question violates the rules and others are saying it does not.
To me, making source requests OT means any source request: pictures, movies, books, paintings, voice recordings, etc etc etc. Any question that begins with "Where can find..." or "Can someone give me examples of books/maps/pictures/films/speeches/scripts/cartoons/machines/inventions/etc etc etc that [list criteria here]" should be off topic.
In the interest of making a clear and unambiguous message for posters (who we have trouble getting to just read the help in the first place), we should clarify the part of the help concerning source requests and define what that means in clear and unambiguous language that a teenager can understand.