Three sources of China's ancient poetry-Chu Ci.

I think this is a controversial issue. Everyone will confirm that ancient poetry has two sources: The Book of Songs and Songs of the South. Scholars are also controversial as to whether Han Yuefu can be regarded as another source. It's a matter of opinion. Personally, I tend to have only three sources: The Book of Songs, Songs of the South and Han Yuefu, among which Han Yuefu is the source of poetry and folk literature.