Per Olaf Fjeld Books

Sverre Fehn

By Per Olaf Fjeld

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Architecture as infrastructure

By Per Olaf Fjeld

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The power of circumstance

By Per Olaf Fjeld

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The lectures revolve around a number of simple but profound questions: Who am I? And from this, What makes me who I am? What creative abilities do I possess that enable me to spark creative energy...

Sverre Fehn

By Per Olaf Fjeld

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Louis I. Kahn

By Emily Randall Fjeld, Per Olaf Fjeld

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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.