If you want to understand the history of the Warring States by reading the Warring States Policy, I am afraid you have to take many detours. See /question/77445424.html for the reason.
For ordinary reading, you can read this one:
Miao, Luo, Warring States Policy, Zhonghua Book Company, 2006.
This book contains the contents of Chapter 105 of the Warring States Policy, with relevant introduction, notes and translation.