Andrew Helfer Books

Batman Returns

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Having vanquished the Joker, Batman confronts a host of new characters, including the Penguin and the seductive Catwoman, and wonders if they are friends or villains.

Disney's talespin ghost ship

By Andrew Helfer

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Scared Stiff Other Creepy Tale Road to Reading

By Andrew Helfer, Andrew Halfer

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Dinosaur Valley

By Andrew Helfer

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The Purr fect Crime

By Andrew Helfer, Golden Books

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Disney's Darkwing Duck

By Andrew Helfer

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Scared stiff and other creepy tales

By Andrew Helfer

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Dinosaur Valley

By Andrew Helfer

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The purrfect crime

By Andrew Helfer

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Darkwing Duck

By Andrew Helfer

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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.