College professors wish that students would do a better job of choosing and evaluating their sources for research. They prefer that students use library databases over websites, as databases contain published, fact-checked works written by experts. Websites can be unreliable because anyone can author them and the information is not verified. Professors also want students to understand how serious plagiarism is, as it can result in failure of the course or expulsion. Students should cite all sources to avoid plagiarism.