Kay_japan

Several sources have told me that I should include the opinions of historians in my essay. However, I am not quite sure how to do that. How should I include it? It would be helpful if you could also give me some examples. Also, I am not sure do I have to include opinions of historians for both Paper2 and Paper3? (I understand that paper 1 is just from sorce book is OK so I do not have to include my original opinions of historian) Thanks for reading and answer this. And if