The legitimate textbook is:

Title: COBOL for the 21st Century
Authors: Nancy Stern, Robert Stern, James P. Ley
Publisher: Wiley
Latest Edition: 11th Edition (2014)
ISBN-13: 978-1118747852

This edition introduces COBOL with structured programming, file processing, and database integration, while acknowledging modern environments like z/OS and Micro Focus COBOL. Despite being nearly a decade old, it remains a standard for academic COBOL courses because the language’s core syntax is stable.

Notably, there is no “26pdf” edition. The “26” may refer to a file size (26 MB) or a chapter count (unlikely, as the book has ~35 chapters). “Verified” is a user‑added tag, not an official designation.

No publisher or academic body “verifies” PDFs floating on file‑sharing sites. In fact, such files often contain:

Wiley does not sell an unprotected PDF of this textbook. Legitimate digital versions are available through VitalSource (eBook with DRM) or Coursmart. Any search engine result promising a free, verified PDF of the complete 11th edition is almost certainly a pirated copy.