What is a disadvantage of using a nonfiction book as a source for research?

The book could provide too many references.
The information in the book may be out of date.
The book might cite other sources as evidence.
The facts in the book might not have been checked.

The information in the book may be out of date.

Explanation:

I saw the question and this was the answer.

i literally just read the book and studied it for months so i could you, but i need to know where these questions are coming from. they are too general.

the two sonnets of sidney most closely follows the division between the octave and the sestet are the astrophel and stella sonnets.