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Thinking in Systems by D. H. Meadows The Secrets of Consulting by J. W. Weinberg Understanding SEO by F. Enzenhofer (wrote it myself, changed a lot for me)

• moss2 4y ago
  Hehe nice self promotion
  • poushkar 4y ago
    It's technically the truth, though :D - It's a book. - Had impact on the commenter's life