CARS is a method for evaluating the credibility, accuracy, reasonableness, and support of online and print sources. It stands for credibility, accuracy, reasonableness, and support. For credibility, one should consider the author's expertise and credentials. For accuracy, check publication dates and comprehensiveness. For reasonableness, consider the author's bias, worldview, and treatment of multiple sides. For support, review listed sources and other authors' opinions of the work. Using CARS helps determine if a source is worth researching and can also guide one's own writing.