Roberto Fortuna Books

Holmens Kirke

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Siden Christian IV lod Frederik IIþs gamle ankersmedje ombygge til kirke for Søværnet, har Holmens Kirke, som blev indviet i 1619, indtaget en plads som en af de mest spektakulære kirker i Danmark....

Danmarks Runesten

By Nationalmuseet Denmark, Lisbeth M. Imer, Roberto Fortuna

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Hvor fantasien kan vokse og blomstre

By Bjorn Ortmann, Roberto Fortuna

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In 1944, Asger Jorn painted together with i.a. artist colleagues Ejler Bille, Erik Thommesen, Henry Heerup, Else Alfelt, Carl-Henning Pedersen and Corneille a 75 meter long frieze in a small kinder...

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.