Refactoring: Improving the Design of Existing Code

Design Patterns in Ruby

Working Effectively with Legacy Code

Clean Code: A Handbook of Agile Software Craftsmanship

Design Patterns: Elements of Reusable Object-Oriented Software

Working Effectively with Legacy Code

Clean Code: A Handbook of Agile Software Craftsmanship

Code Complete: A Practical Handbook of Software Construction, Second Edition

The Pragmatic Programmer: From Journeyman to Master

Test Driven Development: By Example

Patterns of Enterprise Application Architecture

Clean Architecture: A Craftsman's Guide to Software Structure and Design (Robert C. Martin Series)

The Mythical Man-Month: Essays on Software Engineering, Anniversary Edition (2nd Edition)

The Clean Coder: A Code of Conduct for Professional Programmers