Read the following excerpt.
"The first impression that one gets of a ruler and his brains," we are told in
The Prince, “is from seeing the men that he has about him." A prudent prince,
Machiavelli said, chose wise men for his council and gave these alone full
liberty to speak the truth to him... --Arthur M. Schlesinger, Jr.
In this excerpt, which source was cited?
O cannot be determined
The Prince
Arthur M. Schlesinger
O Machiavelli

A research source is a type of media where a person can search for true and correct information for creating another type of informational media.

In this case, a research source could be:

Books.
Magazines.
Researches.
Newspapers.
Cards.
Videos.
Films.
Interviews.

In the excerpt shown in the above question, we can see that the author Arthur M. Schlesinger, while writing a text, researched information in the book "The Prince" written by Machiavelli.

This book is presented in Schlesinger's text, proving that this was the research source used by him.

In this case, we can conclude that a research source aims to enrich a text and promote relevant information about the topic addressed.

You can get more information about this at the link below:

https://brainly.com/question/336747?referrer=searchResults