How different is Bob Doto's A System for Writing from Antinet Zettelkasten?
Doto's book is far more focused, well-written, and actually edited. Scheper's less well written and in need of heavy editing. Save yourself the extra 400 pages and spend that time practicing the craft instead.
If you were starting from scratch without any knowledge of the area, I would highly recommend Doto's work, possibly mention Ahrens in passing, and not suffer anyone to mention Scheper's book. If you're an academic, I would recommend Umberto Eco or perhaps if a historian, one of the many books on historical method like Barzun, Gottschalk, or Goutor.
As background, both Scheper and Doto sent me pre-publication drafts of their work-in-progress to read. I've also read the majority of other books, papers, articles, and works in the space over the past 150+ years including nearly 100% of the references footnoted the two texts referenced. See also: https://boffosocko.com/research/zettelkasten-commonplace-books-and-note-taking-collection/



