Jen Calleja Books

Made on Earth: What we wear. Where it comes from. Where it goes.

By Wolfgang Korn, Jen Calleja

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Goblins Jen Calleja Rachel Louise Hodgson

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Pine Islands

By Jen Calleja, Marion Poschmann

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Nicotine

By Gregor Hens

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NAMED A BEST BOOK OF THE YEAR BY THE ECONOMISTBy turns philosophical and darkly comic, an ex-smoker’s meditation on the nature and consequences of his nearly lifelong addiction.Written with t...

Pine Islands

By Jen Calleja, Marion Poschmann

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Pine Islands

By Jen Calleja, Marion Poschmann

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Pine Islands

By Jen Calleja, Marion Poschmann

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Dance by the Canal

By Jen Calleja, Kerstin Hensel

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Mountains of the World

By Dieter Braun, Jen Calleja

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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.