What are the literatures on poetry research in Han and Tang Dynasties?

China's ancient materials, such as Complete Poems of Tang Dynasty, are huge, and you can find the collection of interested people. If you generally know, you can buy an appreciation dictionary of ancient poetry, which is enough for a person to read for several months. If you have a deeper understanding, you can find something of Mr. Lin Geng, an old professor in Tsinghua University. There is also a foreigner named Yu Wensuo 'an, who writes very well.