Personally, I think the similarity of the three books lies in the different descriptions of the same period of history from Liu Bang to Emperor Wu of the Han Dynasty. You can compare the similarities and differences of the three books in this period and get the similarities and differences of their historical thoughts and methods. I believe this will be a good paper, which depends on your literary history. My master thesis is a comparison between Historical Records and Zuo Zhuan. Compare the similarities and differences between the two books. You can find another book on HowNet. Historical Methodology published by Du Peking University Publishing House, especially the chapters on historical imagination and historical truth, historical narrative and historical interpretation. Read through this book and then compare the three history books. I believe there will be writing inspiration. Any question can be discussed again.