Source (n.) in a newspaper are chosen not for expertise but for vested interest, and that choice is itself the propaganda.
Source (n.) told a Times correspondent nothing pro-Sandinista in fifty articles: 9 percent of Nicaraguans backed the opposition, and so did 100 percent of his interviewees.
Source (n.) that are well chosen can shield extreme bias behind a facade of objectivity.
A Source (n.) chosen carefully does most of a propagandist's work: interview only one side and the account reads as plain fact.
A Source (n.) you depend on for tomorrow's news is very hard to call a liar today, even when he tells whoppers.
A Source (n.) comes bundled with a frame: choose your experts and you have already chosen who is presumed guilty and which questions will go unasked.