Andrej's Reviews > Design Patterns: Elements of Reusable Object-Oriented Software

I've consulted this book on several occasions in my career, but never really read it from beginning to the end.
It's certainly an old one - 1994 (and therefore the code examples are not all that consistent with the modern trends ex. Smalltalk), and in something as fast evolving like software engineering this one is still more than relevant and go-to book for many experienced engineers.

Should be considered in every advanced object-oriented and even general software engineering course in colleges everywhere.