Halmos' book on set theory is praised for its clarity, though it may be terse. The Dover book by Patrick Suppes, "Axiomatic Set Theory," is noted as a cheaper alternative. Herbert B. Enderton's "Elements of Set Theory" is recommended for its accessible style and comprehensive coverage of both naive and axiomatic set theory, making it suitable for students with limited mathematical maturity. In contrast, Enderton's "A Mathematical Introduction to Logic" is considered more challenging, requiring a solid algebraic background, and is better suited for graduate students in mathematics. Overall, these resources offer valuable insights into set theory and mathematical logic for varying levels of expertise.