Basic Mathematics for Electronics
Even though this text book is 25+ years old it still has very useful info. This particular edition will always be useful.
Calculus for Electronics
CALCULUS FOR THE ELECTRICAL AND ELECTRONIC TECHNOLOGIES
Semiconductor Circuit Approximations: An Introduction to Transistors and Integrated Circuits
Electronic Principles
Transistor Circuit Approximations
Electronic Principles with Simulation CD
Grob: Basic Electronics (Electronics Books Series)