Robert L. O Connell Books

Fast Eddie

By Robert L. O Connell

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The Ghosts of Cannae

By Robert L. O Connell

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NATIONAL BESTSELLERFor millennia, Carthage’s triumph over Rome at Cannae in 216 B.C. has inspired reverence and awe. No general since has matched Hannibal’s most unexpected, innovative,...

Revolutionary

By Robert L. O Connell

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From an acclaimed military historian, a bold reappraisal of young George Washington, an ambitious if reckless soldier destined to become the legendary general who took on the British and, through h...

Sacred vessels

By Robert L. O Connell

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Fierce patriot

By Robert L. O Connell

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Team America

By Robert L. O Connell

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Team America

By Robert L. O Connell

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Team America

By Robert L. O Connell

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Sacred Vessels

By Robert L. O Connell

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Sacred Vessels

By Robert L. O Connell

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.