2) Tuan Zhuan (彖傳), Lower, Treatise on the Judgements of the Hexagrams, Part II
3) Xiang Zhuan (象傳), Upper, Treatise on the Symbolism, Part I
4) Xiang Zhuan (象傳), Lower, Treatise on the Symbolism, Part II
5) Xi Ci Zhuan (繫辭傳), Upper, Treatise on the Appended Words, Part I
6) Xi Ci Zhuan (繫辭傳), Lower, Treatise on the Appended Words, Part II
7) Wen Yen Zhuan (文言傳), Treatise on the Elaboration of the Words
8) Shuo Gua Zhuan (說卦傳), Treatise on the Discourse on the Trigrams
9) Xu Gua Zhuan (序卦傳), Treatise on the Sequence of the Hexagrams
10) Za Gua Zhuan (雜卦傳), Treatise on the New Sequence of the Hexagrams
https://baike.baidu.com/item/易经
https://baike.baidu.com/item/周易/6219
https://zhuanlan.zhihu.com/p/83565371
English Language Reference:
Chung Wu PhD: The Essential s of the Yi Jing, Paragon, (2003), Page xxi
(I exchanged letters a few years ago with this true gentleman).