Answer: Based on the information in the excerpt, it should be noted that the main source of the information is Nick Carraway.
Explanation:From the excerpt, it can be deduced that Nick is extremely biased towards Gatsby. In this case, the feeling is meant to be a mysterious and fascinating one.
Also, we can learn about Gatsby through gossip or things around his house e.g. the uncut library book pages. This is vital in order to understand the theme in the story.