The Journey to the West's Romance of Gods, etc. All of them are unorthodox and basically changed beyond recognition by the author. You can read them as magic novels, but don't take them seriously. In fact, it is also a magical novel written by the ancients. If it is not good, those fictional novels written today will be taken seriously by future generations, hehe.
Biography of the Eight Immortals can be used as a reference to understand the story of the Eight Immortals. The author himself is a Taoist priest. From the book, we can see that the author has certain attainments and the credibility of the book is very high.