Where is the poem? I could help if you uploaded a picture
Answer: if you understand the book that would help. a summary would help.
Explanation:
Usually if information is used from other sources, it cited in the back of the book. They would cite what info was taken and used. You could always check there to see if it's accurate. Usually it's labeled as "Works Cited".
Hoped this helps!!
~Bob Ross™
Grammar, spelling, pronounciation and vocabulary.