Recommendations for a college thermodynamics textbook include "Engineering Thermodynamics" by Rayner Joel, which is suitable for mechanical engineers and covers adiabatic and polytropic processes in detail. The NASA Compressed Gas Handbook is also suggested for its focus on gas thermodynamics and is available for free. For a more advanced understanding, "Basic Thermodynamics" by Carrington and "Thermodynamics and an Introduction to Thermostatistics" by Callen are recommended, with the latter being accessible to non-physicists. General physics texts like Sears and Zemansky or Resnick and Halliday can introduce adiabatic processes but may lack the depth desired. These texts collectively provide a comprehensive foundation in thermodynamics theory and applications.