Question: "What traditional sources of knowledge did the journals challenge?"  Context: "Jonathan Israel called the journals the most influential cultural innovation of European intellectual culture. They shifted the attention of the "cultivated public" away from established authorities to novelty and innovation, and promoted the "enlightened" ideals of toleration and intellectual objectivity. Being a source of knowledge derived from science and reason, they were an implicit critique of existing notions of universal truth monopolized by monarchies, parliaments, and religious authorities. They also advanced Christian enlightenment that upheld "the legitimacy of God-ordained authority"—the Bible—in which there had to be agreement between the biblical and natural theories."  Answer:
The answer to this question is:
monarchies, parliaments, and religious authorities