A few references and callbacks in JoJo to previous manga that Araki has made : r/StardustCrusaders

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JJBA Phi+Tau - JORGE JOESTAR by devilkais on DeviantArt

JoJo's Bizarre Explainer – Podcast – Podtail

JoJo's Bizarre Adventure, Chp 145

Araki really put in a sex reference, /r/ShitPostCrusaders/, JoJo's Bizarre Adventure

JoJo 6251 - JoJo's Bizarre Encyclopedia

JoJo's Bizarre Adventure - A Quick Guide, The Indianapolis Public Library

What Inspired Manga Artist Hirohiko Araki?

JOJOmenon - JoJo's Bizarre Encyclopedia

What are some facts about JoJo's Bizarre Adventure that aren't well-known? - Quora

Can you understand JoJo's Bizarre Adventure without watching both parts of Diamond is Unbreakable and Golden Wind at least twice each? - Quora

What's something the anime did/changed that you did not like? : r/ StardustCrusaders

Interview Archive, JoJo's Bizarre Wiki

References/easter eggs in Jojo : r/StardustCrusaders

Araki loves reusing pose references : r/StardustCrusaders