How to make a two-sided shader material in Blender 2.8 EEVEE and Cycles - BlenderNation
Double-Sided Materials – Blender Knowledgebase
Is it better to have models that have double faces or is it better to have a two-sided material instead? - Pipeline & Plugins - Epic Developer Community Forums
how to create double sided materials in blender - YouTube
Turn off double-sided faces for sculpting... - Modeling - Blender Artists Community
Blender Tip - How to make Double Sided Materials - 217 - YouTube