What resources on atonement theory do you recommend?

I’ve been studying a lot of atonement theory lately. What atonement theory do you subscribe to? (Not that you just have to like just one).

What authors do you read after?

What is your favorite atonement theory book, sermon, or article?

What are your thoughts on penal substitution? Christus Victor? Moral influence? Governmental theory? Girardian scapegoat theory? etc?