s:fr:Wolff Christian-Cours de mathematiques-1757-Tome 3.djvu |date=2021-02-11 |source=Internet archives English French Traité de mathématiques de Christian...
s:fr:Wolff Christian-Cours de mathematiques-1757-Tome 1.djvu |date=2021-02-11 |source=Internet archives English French Traité de mathématiques de Christian...
s:fr:Wolff Christian-Cours de mathematiques-1757-Tome 2.djvu |date=2021-02-11 |source=Internet archives English French Traité de mathématiques de Christian...
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