Modules, The Julia Language, 2024 - The official documentation provides the authoritative description of Julia's module system, including the export, using, and import keywords, and their role in code organization.
Think Julia: How to Think Like a Computer Scientist, Ben Lauwens and Allen B. Downey, 2019 (O'Reilly Media) - An accessible introductory book on Julia programming, with a dedicated chapter (Chapter 8) explaining modules, their creation, and the use of export, using, and import for beginners.
Julia High Performance, Bogumił Kamiński, Paweł Rokita, 2018 (Packt Publishing) - This book covers advanced aspects of Julia programming, including a section on organizing code with modules and packages, providing context for how these features support scalable and performant applications.