Answer:
"The Japanese have a word for insular which is literally the mental state of the people living on islands: shimaguni konjo."
Explanation:
External sources refer to information placed in a text that was taken from another text, or that was approached by another author, or another professional, that is, information created outside the work presented, but that is relevant to the same .
A direct quote, on the other hand, is one in which the author of one text shows exactly what the author of another text has said about a particular subject.
In the text above, we can see a direct quote from an external source on the line: "The Japanese have a word for insular which is literally the mental state of the people living on islands: shimaguni konjo." These are the words used by the Japanese scientist Donald Keene and which are relevant to the text presented.