Katherine Factor Books

Choose Your Own Adventure Spies: Harry Houdini

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Perform sleights of hand to secure secrets in this interactive book where YOU decide what happens next! Packed with 22 possible endings! Choose Your Own Adventure books–the 4th bestselling c...

Choose Your Own Adventure Spies: Noor Inayat Khan

By Rana Tahir

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Leave a life of luxury to help defeat the Nazis in this interactive book where YOU decide what happens next! Packed with 22 possible endings! Choose Your Own Adventure books–the 4th bestsell...

Ideal Weights

By Katherine Factor, Mahnaz Azim

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Sybil Society

By Katherine Factor

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Choose Your Own Adventure Spies: Mata Hari

By Katherine Factor

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Dance in the face of danger in this interactive book where YOU decide what happens next! Packed with 23 possible endings! Choose Your Own Adventure books–the 4th bestselling children’s...

Choose Your Own Adventure Spies: Spy for Cleopatra

By Katherine Factor

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Save the world’s greatest library in this interactive book where YOU decide what happens next! Packed with 22 possible endings! Choose Your Own Adventure books–the 4th bestselling chil...

Big Bigfoot's Secret Vacation

By Katherine Factor

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Choose from 9 possible endings in this interactive book from the bestselling Choose Your Own Adventure series, now for 5- to 8-year-old readers!Filled with colorful illustrations, these books for l...

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.