What kind of problems?
What gas turbine textbooks do you already have?
What textbooks does your company have?
Are you looking at operational problems, or "pure" (theoretical) heat exchange theory and heat engine efficiency theory problems? Or design problems (bearing designs, leakage, fuel systems design, cooling air calculations, heat expansion, creep, sag, foreign object damage, clearances, seals, high temperature metallurgy, fin cooling air methods, fin ceramic coatings and internal air flow, exhaust gas problems and pollution control, instrumentation and sensors and controls?