List of Programming Languages Wikipedia
Computer Language History
Genealogy of programming languages
simple and
complex
2018 Top Programming Languages (IEEE Spectrum, 2018 Ranking)
Computer Programming History Technology Guide (Certified Staffing Solutions)
Konrad Zuse and the World's First Comptuer
Which Programming Language Should I Learn First
from freeCodeCamp, https://medium.freecodecamp.org/what-programming-language-should-i-learn-first
Extra Scheme problems, some answers
Prolog for creating Websites by Anne Ogborn
Stack frames and calling subroutines,
from University of Maryland, Baltimore County, course in Computer Architecture