How to find ancient books resources in ancient literature

The Book of Songs of Chu and Yan Kejun's Poems in the Pre-Qin, Han, Wei, Jin, Southern and Northern Dynasties: A suggestion of Qin Li's Sikuquanshu: To read ancient Chinese, you should find a better version, such as Zhonghua Book Company, Commercial Press and Shanghai Ancient Books Publishing House, and it is best to download the photocopied version in PDF format online and offline. Too many other typos are not good.