Powers & Abilities - Admirals and rokushiki

OPRP: Ability Guide p4 Rokushiki and Devil Fruit by MidnightSunArt on DeviantArt

Rokushiki, One Piece Wiki

Rob Lucci's initial Vivre Card has been changed from Learned Haki to strengthened Haki related to Rokushiki : r/OnePiece

One Piece: 5 Marines Who Can Become An Admiral (& 5 Who Can't)

One Piece: The Strongest Vice-Admirals, Ranked

How strong is each admiral without their Devil fruit (including Sengoku Prime and Old)? : r/OnePiecePowerScaling

Why isn't Monkey D. Garp an admiral? - Quora

In Regards to Admirals and Conquerors Haki, and How It is a Circle : r/OnePiece

Chapter Discussion - Rokushiki is based on Haki, Page 7

Admiral, One Piece Wiki