Principled BSDF Shader Settings for Steel in Blender - Jigasu.Com
Principled BSDF is based on PxrDisney - PxrDisney is legacy - Blender and CG Discussions - Blender Artists Community
Principled BSDF reflection affects whole eye - Materials and Textures - Blender Artists Community
Blender 2.8 How to use PBR textures with principled bsdf Cycles/Eevee - YouTube
Basic Principled BSDF – Blender Knowledgebase
Principled Volume — Blender Manual
Here's a free Principled BSDF Shader guide to help Blender users, an extract from the free PDF guide and YouTube tutorial below, hope you find it useful :D : r/learnblender
Principled BSDF IOR Fix - BlenderNation
All Blender Principled BSDF Settings Explained - YouTube
How to Use Blender's new ULTIMATE Shader: Principled — Blender Guru