The textbook "Theory of Analytic Functions of a Complex Variable" by Friedrich Sommer provides a comprehensive introduction to the mathematical concepts and theories related to analytic functions in complex variable analysis. In its third edition, published in 1976, the subject is treated in detail and is of interest to both students and professionals in the fields of mathematics and natural sciences. The paperback binding and the 620 pages of content allow for an in-depth engagement with the material. The language of the book is German, making it accessible to a wide audience. The collaboration with Heinrich Behnke, a renowned mathematician, emphasizes the scientific relevance of the work. This nonfiction book is a valuable reference for anyone dealing with the fundamentals and applications of analytic functions in complex analysis.