Don't worry, the authors of phonology books are mostly famous scholars and professors, and the publishing houses are mostly famous academic publishing houses in China. I think the following books are very good, you can refer to the following. A Course in Phonology, Tang Zuofan, Peking University Publishing House. Mr. Tang is Professor Peking University, a famous scholar in the field of linguistics in China. This book is concise and suitable for beginners, but the disadvantage is that it is too brief, so it is best to study with other books.

Lin Dao's Summary of Phonology, published by the Commercial Press. Lin is a giant in the field of linguistics in China. There are some printing problems in this book, but there are many typos.

Hu Anshun's General Theory of Phonology was published by Zhonghua Book Company. Hu is a professor at Shaanxi Normal University. His books are well compiled and distinctive, which is suitable for beginners.

Yang Jianqiao's Lectures on Chinese Phonology, Fudan University Press, is relatively advanced.

In addition, there are many books, such as books written by Wang Li, Zhang Shilu, Li Rong and others. There are many online books that can be found at once.