Christopher Behrens Books

Penis Pokey

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You’re the star in this very adult board book! We dare you to try to make it through the (w)hole book without laughing! Every scene in Penis Pokey has one thing missing, and you have to compl...

Penis Pokey

By Christopher Behrens

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Free Electron Lasers in the Ultraviolet and X Ray Regime

By Jorg Rossbach, Peter Schmuser, Martin Dohlus, Christopher Behrens

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Free Electron Lasers in the Ultraviolet and X Ray Regime

By Jorg Rossbach, Peter Schmuser, Martin Dohlus, Christopher Behrens

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Free Electron Lasers in the Ultraviolet and X Ray Regime

By Jorg Rossbach, Peter Schmuser, Martin Dohlus, Christopher Behrens

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Dai, fallo!

By Christopher Behrens

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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.