Grupo Editorial Patria sells the official e-book (ePub/PDF with DRM) for roughly $20–$35 USD. Search for "Ingeniería Económica Matias Arreola Patria e-book." This is often cheaper than printing the pirate PDF.
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Additionally, check if your university is part of Redalyc or SciELO. While they may not host Arreola’s full book, they host tons of free engineering economy papers that supplement the core text. Grupo Editorial Patria sells the official e-book (ePub/PDF
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