For self-study in differential equations, especially for electrical engineering majors, several highly recommended textbooks include "Differential Equations and Linear Algebra" by C. Henry Edwards and David E. Penney, which offers a clear introduction and practical applications. Another strong option is "Elementary Differential Equations and Boundary Value Problems" by William E. Boyce and Richard C. DiPrima, known for its comprehensive coverage and real-world examples. Additionally, "Applied Differential Equations: An Introduction" by Vladimir Dobrushkin provides a more theoretical perspective, focusing on fundamental concepts and applications in engineering. Each of these books is suitable for independent learning, and students are encouraged to choose one that best fits their learning style and objectives.