NumPy: Reading and writing files, NumPy Developers, 2024 - Official and comprehensive guide to NumPy's array input/output functions, including savetxt, loadtxt, save, load, savez, and savez_compressed.
Python for Data Analysis, Wes McKinney, 2022 (O'Reilly Media) - A foundational book covering data manipulation with NumPy and Pandas, including practical examples of saving and loading numerical data. 3rd edition.
Pandas: Input/output tools, The Pandas Development Team, 2024 - The official guide to Pandas' I/O capabilities, offering more flexible methods for reading and writing structured data, particularly useful for complex text files.