As GPEC Europe we can recommend the following books:
Acquittal: Praying for Your Deliverance in the Courts of Heaven, written by Marie-Thérèse Van
Impact: Prophesy and change the world, written by Arleen Westerhof
You can find more information about these two books here
AUDIO OR VIDEO TEACHINGS
It is our intention to create teachings on the Courts of Heaven in the near future.