Derek Fridolfs Books

Batman

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Featuring versions of Batman, Robin, the Joker and the other heroes and villains of Gotham City as children, this Eisner Award-nominated series follows some of DC s most famous (and infamous) heroe...

Batman

By Paul Dini, Peter J. Tomasi, Derek Fridolfs

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Science Fair Crisis

By Derek Fridolfs

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Detention of doom

By Derek Fridolfs

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When Lex Luthor's family company, Lexcorp(TM), invites kids from all over the country to attend an honors ceremony, Clark Kent is happy to participate. That is, until his award trophy creates a por...

Fort Solitude

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Study hall of justice

By Derek Fridolfs

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Detention of doom

By Derek Fridolfs

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DC Comics La Soci t Secr te Des Superh ros

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DC Comics La Societe Secrete Des Superheros

By Derek Fridolfs, Pamela Lovas

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Darkseid and the Fires of Apokolips Justice League

By Derek Fridolfs

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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.