Based on the title you provided, this refers to the definitive technical book authored by Hany Moustapha (along with M.F. Zelesky, N.C. Baines, and F.-K. Benjelloun).
Searching for this exact PDF requires a strategic approach. Due to copyright laws and the proprietary nature of turbomachinery design, the file is not widely available on open public search engines. Here are the legitimate, high-success methods: Axial And Radial Turbines By Hany Moustapha.pdf
The choice between axial and radial turbines depends on flow rate, pressure ratio, efficiency requirements, and cost constraints. Axial turbines dominate large gas turbines and aero-engines; radial turbines are preferred for turbochargers, APUs, and small gas turbines. Based on the title you provided, this refers