Allan Tonnesen Books

Magtens besegling

By Allan Tonnesen

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Helsingors Udenlandske Borgere Og Indbyggere Ca. 1550 1600

By Allan Tonnesen

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Hele samfundets eje

By Allan Tonnesen, Claus M. Smidt, Ulla Kjaer

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Hele samfundets eje markerer 100-året' for den første danske bygningsfredningslov.0Loven var det første nordiske initiativ til at beskytte den byggede kulturarv, og fædrene bag den nye lov var i hø...

233 danske borgerhuse

By Allan Tonnesen

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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.