The three sources provide information on engineering interviews. The first source, from Indeed.com, lists common engineering interview questions and provides sample answers, along with guidance on how to answer those questions. The second source is a YouTube video transcript offering interview questions and answers, and tips on how to present yourself as a competent engineer. The third source, an article from InterviewPrep.com, focuses on interview questions related to risk management, an essential part of many engineering roles, along with strategic approaches and example answers to help potential candidates succeed.