MetalByTutorials/05-lighting-fundamentals/resources/references.markdown

Original 1975 Phong Reflection Model paper

Scratchapixel

Nvidia lighting tutorial

3D Game Engine Programming - Jeremiah van Oosten

Stop Using Normal Matrix

Great books

Fundamentals of Computer Graphics, Fourth Edition - Steve Marschner, Peter Shirley

3D Graphics for Game Programming - JungHyun Han