The kind of appeal that relates to the credibility or authority of any source is the ethical appeal.
An appeal is referring to a situation when some kind of request has been made to the general public on an urgent basis.
The ethical appeal is one of the rhetorical appeals which portrays the writer, to be honest, knowledgeable, and ethical about the topic for which he/she is addressing to the audience. This is also known as ethos. The use of him or herself depicts the credibility and trustworthiness of the author.
Therefore, the ethical appeal is the one that depends upon the credibility or authority of any source.
Learn more about the ethos in the related link:
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