Hans Helweg Books

The Second Big Olga Da Polga Book

By Michael Bond

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Olga meets her match

By Michael Bond

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The further adventures of Olga as she matches wits with Boris, another guinea pig, who tells stories even taller than her own.

Olga carries on

By Michael Bond

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Olga, the guinea pig, meets new challenges as she fights a fire and sets a trap for an uninvited guest.

Charlotte parlotte

By Xavier Seguin, Michael Bond, Hans Helweg

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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.