Python 3 Documentation: Built-in Functions, Python Software Foundation, 2023 (Python Software Foundation) - This provides the official and definitive explanation of Python's built-in type conversion functions (int(), float(), str(), bool()) and their behavior.
Python for Everybody: Exploring Data in Python 3, Charles Severance, 2023 (Charles Severance) - This widely-used textbook and accompanying course provides a foundational understanding of Python programming, including a dedicated section on data types and how to perform type conversions.