https://en.wikipedia.org/wiki/Computer_Power_and_Human_Reaso...
The Pragmatic Programmer (makes the cut by being released in 1999, even though there's a second edition)
https://en.wikipedia.org/wiki/The_Pragmatic_Programmer
Refactoring by Martin Fowler (also a 1999 book with a more recent edition)
https://martinfowler.com/books/refactoring.html
https://en.wikipedia.org/wiki/Computer_Power_and_Human_Reaso...
The Pragmatic Programmer (makes the cut by being released in 1999, even though there's a second edition)
https://en.wikipedia.org/wiki/The_Pragmatic_Programmer
Refactoring by Martin Fowler (also a 1999 book with a more recent edition)
https://martinfowler.com/books/refactoring.html