Resources on setting boundaries

[Whatthechicken]

Does anyone have any recommendations on books or websites on learning to set boundaries?

Where to Draw the Line by Anne Katherine
Walking on Eggshells by Paul Mason and Randi Kreger
The entire Issendai website section here: https://www.issendai.com/psychology/estrangement/

Some of it is understanding how to respond to people who don't like and can't cope with other people's boundaries, and about your own boundaries and why they are as they are, so the more in depth stuff helps.