Rumor Guide - Who Designed Super Saiyan 4?

Kanzenshuu provides the back history, context, and facts surrounding Super Saiyan 4's design by Katsuyoshi Nakatsuru (not Akira Toriyama!)

Every Level of Super Saiyan, Ranked

Rumor Guide - Who Designed Super Saiyan 4?

Dragon Ball Xenoverse Adds Vegito And Super Saiyan 4 Goku - Siliconera

What is the precise nature of Super Saiyan 4 in terms of unique abilities and properties? - Quora

Super Saiyan 4 Broly, Evil Goku in New 2015 DBZ Movie, And Super Saiyan God 2 Are RUMORS!!

Dragon Ball Super Season 2 Release Date Rumors: Is It Coming Out?

Dragon Ball Reveals New Super Saiyan 4 Form

Why Dragon Ball GT's Super Saiyan 4 Actually Matters

Dragon Ball Reveals Its First Female Super Saiyan 4

New Dragon Ball Z: Battle of Gods Images Hit - IGN

Dragon Ball GT: S.H. Figuarts Super Saiyan 4 Vegeta Official Images Revealed - ORENDS: RANGE (TEMP)

Rumor Guide - The Earth Will Explode If Gohan Turns Super Saiyan