diff --git a/README.md b/README.md
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@@ -6,4 +6,7 @@ WIP: Rendu d'une carte QGIS en script OpenSCAD pour une impression 3D en volume
 
 * SolidPython2 https://github.com/jeff-dh/SolidPython
 * Using PyQGIS in standalone scripts https://docs.qgis.org/3.44/en/docs/pyqgis_developer_cookbook/intro.html#using-pyqgis-in-standalone-scripts
-* OpenSCAD braille library https://github.com/KitWallace/openscad/blob/master/braille.scad
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+* OpenSCAD braille library https://github.com/KitWallace/openscad/blob/master/braille.scad
+* Guidelines and Standards for Tactile Graphics https://brailleauthority.org/guidelines-and-standards-tactile-graphics
+* Braille signage guidelines https://www.brailleauthority.org/signage/
+* Code braille français uniformisé https://www.sante.gouv.fr/fichiers/bo/2014/14-02/ste_20140002_0000_0086.pdf
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