Annette Langen Books

After floating up into the sky in a balloon that Sophie built, Felix, Sophie's stuffed rabbit, is off on another fantastic voyage and sends back informative letters from all the interesting places...

Felix's Christmas around the world

By Langen Annette

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Felix, what time is it?

By Langen Annette

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Felix joins the circus

By Langen Annette

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Sophie's stuffed rabbit, Felix, disappears at the circus and then sends her letters describing his adventures.

Felix's cookbook

By Langen Annette

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Sophie's favorite snuggly rabbit Felix comes to the rescue when her family falls sick.

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.