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No Books in print on Systemd?

I know there are controversies on Systemd (including in Debian  --  for example, Devuan), but I want to learn enough about it to (Horrors!)  become an expert.

And yes, I have found several online resources, including on the Debian Wiki.  (I'm also reading https://www.freedesktop.org/wiki/Software/systemd/ ).

My problem?  My best times for reading are times where a "Paper Book" is best.  Unfortunately, I haven't found any.

If I'm missing something, please tell me.  Otherwise, do any of you know if someone's working on a Book?

Thank you.

Kenneth Parker