Answer:
Analyze the author's education and professional background.
Step-by-step explanation:
One of the easiest and most reliable ways to check the reliability and the validity of a resource is to analyze the author and his background. If an author is well-educated in the topic, he is more likely to express views that are well-respected in that community. Moreover, if the author is an expert in the area, it is likely that he will be able to better include sources and information that are relevant to the study of the subject.