Edward Yourdon: Structured Design (1979)

Book cover

Introduced a lot of interesting concepts to understand code, some of which we take for granted, or that have solidified in the collective subconscious of all programmers:

Full reference I use in my notes:

[#yourdon1979sd]: Edward Yourdon and Larry L. Constantine (1979):
  _Structured design_, Englewood Cliffs, N.J.: Prentice-Hall.