What are some essential reads on Juche and the development of the revolution in the DPRK?

I've read "On the Juche Idea" and listened to a few podcasts. Thanks in advance!

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Patriots, Traitors and Empires: The Story of Korea's Fight for Freedom by Stephen Gowans. I've only read excerpts of it, but it was really informative about the level of absolute compradorship that was present in "South Korea" from Japan's rule to the US'