Robin uses Tekkai by MSJPSakura on DeviantArt

Rokushiki Robin 33 by Shinjojin on DeviantArt

Could Mihawk or Shanks Know Rokushiki? : r/OnePiecePowerScaling

Rokushiki/Kami-e, OnePiece Fanon Wiki

Character Profile - Jyabura

Rokushiki - One Piece

Rokushiki, Rob Lucci (One Piece)

Vivre Card Databook – Index Set (some new information) – The Library of Ohara

Chapter Discussion - Rokushiki is based on Haki, Page 8

Rokushiki/Tekkai, OnePiece Fanon Wiki

The Nico Robin: Rokushiki Style Project - Tetsuhana HanaRin(Iron flower Flower wheel) - This is Robin's very own take on the Tekkai Rin (Iron mass Wheel) technique that's similar to the original