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Answer: credentials
Explanation:
In order for a research source to be useful, its author(s) must have credentials.
We should note that the credentials of an author has to do with the skills, information and the education that an author has that makes the author qualified to be able to elwrite on a particular topic.
Please edit your question to the available answer choices.<span />
Answer:
Answers A an B
Explanation:
Those books would have some information about his past and how he was and was not successful during his presidential time period.