
The landmark 1965 paper, together with new commentaries and interpretations, essential for students and professionals in architecture and urbanism
A Pattern Language is great but a lot of folks miss that it's part 2 of a greater work, with part 1 being The Timeless Way of Building.
Another great Alexander book that flies under the radar is Notes on the Synthesis of Form. It's a little hard to read but there is deep deep insight about design and the design process in that little book. Highly recommend.
And lastly, anyone interested should read A City Is Not A Tree: https://www.patternlanguage.com/archive/cityisnotatree.html
http://worrydream.com/refs/Alexander%20-%20A%20City%20Is%20N...
0) The Conspiracy Against The Human Race
1) The Machine Stops
2) The One Dimensional Man
3) A City Is Not A Tree
4) Influence
5) La Technique
6) anything from James C. Scott
7) ...
Figuring out the links is left as an exercise to the reader.