Donburi bowl resources

What's up fellow cooks and chefs!

In the never ending quest to learn cooking, I would like to improve a specific subset of skills; the donburi bowl. Always delicious and can be very quick to make. I need a break from more elaborate meals and want to deep dive easier, over rice, meals.

Does anyone know of dedicated books, sites, or resources where there is a deep dive into this topic specifically? Thanks all!