Libraries in Zurich:
- ETH-Library: https://www.e-rara.ch/zut/content/titleinfo/1447164
- Zentralbibliothek Zürich: https://www.recherche-portal.ch/primo-explore/fulldisplay?docid=ebi01_prod004365890&context=L&vid=ZAD&lang=de_DE&search_scope=default_scope&adaptor=Local%20Search%20Engine&isFrbr=true&tab=default_tab&query=any,contains,resolution%20des%20quatre%20principaux%20problèmes%20d%27architecture&sortby=date&facet=frbrgroupid,include,372671776&offset=0
Other libraries in Switzerland:
- Swissbib: https://www.swissbib.ch/Record/132158671
- Swissbib Basel/Bern: https://baselbern.swissbib.ch/Record/36509837X
Online libraries:
- Google Books: https://books.google.ch/books?id=rq9SAAAAcAAJ&printsec=frontcover&dq=Résolution+des+quatre+principaux+problèmes+d%27Architecture&hl=de&sa=X&ved=2ahUKEwjD57jtqLbsAhWjsaQKHQyzAOkQ6AEwAHoECAQQAg#v=onepage&q=Résolution%20des%20quatre%20principaux%20problèmes%20d’Architecture&f=false
- Gallica: https://gallica.bnf.fr/ark:/12148/bpt6k1521143b.r=Résolution%20des%20quatre%20principaux%20problèmes%20d%27Architecture?rk=21459;2
- Architectura.cesr: http://architectura.cesr.univ-tours.fr/Traite/Notice/ENSBA_LES1835.asp?param=