The two you listed are more than enough. There's a reason they don't cover the Bc4 as much as the Bg5 line: it's just inferior and less popular than the main line.
Classical Sicilian Sozin variation resources?

Unfortunately I don't have chessbase but I'll try to look for some annotated games online, thanks
It's definitely not as critical as the Richter-Rauzer but the positions that you can get are by no means easy to play and work around without great guidance, for example
After 13...Nb4, it's such a difficult position to play in Bologan, Viktor (2665) vs Lupulescu, Constantin (2558) ( https://lichess.org/ikxSUFxH/black#113 )reached a position where the game reached +5 more than once in the game but black managed to swindle and win... It stemmed from someone as strong as Lupulescu not knowing how to handle the position & proceed in the middle game! Which is concerning tbh
I should probably try to see how stockfish handles the position but it's difficult to do this for every critical variation in the Sozin 😅
The best resource is a data base. If you don not have ChessBase, then there are free alternatives like 365chess.com and chessgames.com.
Fischer believed 6 Bc4 to be superior to 6 Bg5 and he was the expert on Najdorf with black. Kasparov also played the Sozin after he was analysing Fischer games for 'My Great Predecessors'.

As mentioned above 365chess.com and chessgames.com are the way to go. I would add The Week in Chess Archives where you can download the games of the latest tournaments. I used it to create my own large database. There you might find useful games.

As mentioned above 365chess.com and chessgames.com are the way to go. I would add The Week in Chess Archives where you can download the games of the latest tournaments. I used it to create my own large database. There you might find useful games.
Ahh thank you very much!

The best resource is a data base. If you don not have ChessBase, then there are free alternatives like 365chess.com and chessgames.com.
Fischer believed 6 Bc4 to be superior to 6 Bg5 and he was the expert on Najdorf with black. Kasparov also played the Sozin after he was analysing Fischer games for 'My Great Predecessors'.
Ahh I'll try to check out that legendary book thankss
Marin has a DVD on the classical Sicilian where he goes into the Sozin in great detail on the early Na5 line vs it [and this line does score well]. I think Golubev's book 'Understanding the Sicilian' has a lot of Sozin [as best I recall]. Yrjöla’s book is good up to but not including the Short-Kasparov match. And I agree: Rauzer is critical but it is still possible to lose quickly vs the Sozin when unprepared. -Bill

It sounds like you're particularly looking for ideas from Black's side?
You might look at Vigorito's recent book on the Najdorf. In the 6. Bc4 chapter, he recommends the unusual (for a Najdorf player) plan of tranposing to the Classical Sozin with 6. . . . Nc6. I don't know enough about Classical move orders to know whether the ensuing analysis will be useful to you, but it might.
From White's perspective, there's Logozar's 1. e4 course on Chessable, which recommends Bc4 against the Classical (and also against the Najdorf).

Marin has a DVD on the classical Sicilian where he goes into the Sozin in great detail on the early Na5 line vs it [and this line does score well]. I think Golubev's book 'Understanding the Sicilian' has a lot of Sozin [as best I recall]. Yrjöla’s book is good up to but not including the Short-Kasparov match. And I agree: Rauzer is critical but it is still possible to lose quickly vs the Sozin when unprepared. -Bill
Ahhh thank you! Wow Golubev wrote a whole book on the Sozin as well, gonna be a great read

It sounds like you're particularly looking for ideas from Black's side?
You might look at Vigorito's recent book on the Najdorf. In the 6. Bc4 chapter, he recommends the unusual (for a Najdorf player) plan of tranposing to the Classical Sozin with 6. . . . Nc6. I don't know enough about Classical move orders to know whether the ensuing analysis will be useful to you, but it might.
From White's perspective, there's Logozar's 1. e4 course on Chessable, which recommends Bc4 against the Classical (and also against the Najdorf).
Thanks for the recommendation! I'll check them out too
I’ve read Yermolinsky’s book on the classical siicilian which kind of covers the sozin (6.Bc4) but I still feel like it’s not enough. Already went through Shankland’s course doesn’t cover it as much which is kind of dissapointing but his Richter-Rauzer coverage is amazing so I’ll let him off the hook.
Haven’t read the Sozin chapter of Yrjöla’s book on the Classical Sicilian but i guess it’s next on my list.
Any other resources for the Fischer Sozin available out there?