Rachael Allen Books

Harley Quinn: Ravenous

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Harley Quinn's journey gets even more chaotic as she falls in love and embraces her inner Super-Villain in the thrilling second book of the Harley Quinn origin trilogy.“Allen’s Harley i...

Harley Quinn: Redemption

By Rachael Allen

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When girls in Gotham City go missing, Harley Quinn is determined to track down their kidnapper. But the only way to outsmart a villain is to engage in a little villainy herself. Don't miss the adre...

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.