Manga Artists Copic Marker Coloring Techniques: Learn How To Blend, Mix and Layer Color Like a Pro: SHIN, Maripori, Yue, Kitamura, Junko, Kawana, Suzu, Kirisaki, Ramiru: 9781940552569: Amazon.com: Books
Copic Markers: Should beginners start with Ciao or Sketch markers? — Marker Novice
Copic Marker Secrets that Free Coloring Tutorials Never mention! — Vanilla Arts Co.