Poul Duedahl Books

De maske udstodte

By Lars Andersen, Poul Duedahl, Louise N. Kallestrup

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Et overordnet historisk perspektiv på normalitet og afvigelse i tid og sted med vægt på både religiøse og verdslige modbilleder - fra middelalderens kættere til den moderne verdens forsøg på at ind...

History of UNESCO

By Poul Duedahl

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History of UNESCO

By Poul Duedahl

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Gudhjemtid

By Poul Duedahl

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Gudhjemtid

By Poul Duedahl

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Gudhjemtid

By Poul Duedahl

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J.C. Christensen

By Peter Ramskov Andersen, Poul Duedahl

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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.