Pei Songzhi's Notes on the Three Kingdoms

Caocaochuan

Zhugeliangchuan

Zhuge Liang who stepped down from the altar (Zhuge Liang's criticism)

History of the Three Kingdoms (Author: Ma Zhijie)

The History of the Three Kingdoms and the Study of the History of the Three Kingdoms (Author: Zhang)

Biography of Guan Yu (Tian)

Most books are about Cao Cao and Zhuge Liang, but Guan Yu is a military commander. There are fewer people devoted to Zhao Yun. As far as I know, no one has written a complete long biography for him.

In addition, if you are interested, I suggest you have a look at The Romance of the Three Kingdoms, which was approved by Mao and annotated by Mao Zonggang. Although The Romance of the Three Kingdoms is fake, some things in it are still very valuable.