Heather Dyer Books

The fish in Room 11

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Toby lives in a hotel by the sea. When his friendship with Eliza and her mermaid parents arouses suspicion, he tries to disguise the mermaids as hotel guests. Trying to hide a family with fins and...

Tina et le pingouin

By Heather Dyer

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Tina helps a penguin escape from the zoo, but soon she realizes that a penguin is a very peculiar pet - and that's just the tip of the iceberg.

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.