Karen Harper Books

The Fyre Mirror Elizabeth I Mysteries Book 7

By Karen Harper

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The queen's secret large print a novel of England's World War II queen

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The queen's secret : a novel of England's World War II queen

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The Last Boleyn

By Karen Harper

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She survived her own innocence, and the treachery of Europe’s royal courts; The Last Boleyn is the story of the rise and fall of the Boleyns, one of England’s most powerful families, through th...

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.