By sources, do you mean the rules of play? Or strategy books? Or historical materials talking about the game?

I've purchased pleasant wooden sets for both Xiangqi and Shogi with a friend. We used to play quite regularly. It shouldn't be too difficult to acquire one.

As far as access to Chinese culture in English, we're in a golden age currently, as more scholars translate materials to permit wider access to them.

But as others have remarked, making Mandarin an important language in the rest of the world is a mark of Chinese success in promoting its culture. More people are learning Mandarin now than ever before.