Moustapha's 2021 review provides a valuable resource for researchers, engineers, and students interested in axial and radial turbines. The review offers a comprehensive overview of these turbines, including their design, performance, and applications. While the review has some limitations, it provides useful guidelines for selecting the most suitable turbine type for a specific application. Overall, the review is a useful contribution to the field of turbomachinery and will be of interest to professionals and researchers in this area.