This site is full of books and articles on Hungarian history for the first half of the C20th. It covers the post-WW1 period, inter-war international relations, political issues during the war, the post-war tug-of-war between the West and Russia, and the 1956 Uprising.

I have quite a bit of time on it and have still only scratched the surface. The books and articles are all of of the highest academic order.

http://www.hungarian-history.hu/lib/index.htm