https://tinyurl.com/y6lfswe5

https://en.wikipedia.org/wiki/Algebraic_topology

http://pi.math.cornell.edu/~hatcher/AT/ATpage.html

https://upennig.weebly.com/

https://www.math.u-psud.fr/~paulin/notescours/cours_topoalg.pdf

http://www.normalesup.org/~oudomphe/seminaires/spf/AT/

https://www.livres-anciens-neufs.com/livre/jean-claude-pont-la-topologie-algebrique-des-origines-a-poincare-pont-jean-claude-presses-universitaires-de-france–1974–1974/5402.html