Picard Christophe Books

Sea of the caliphs

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"How could I allow my soldiers to sail on this disloyal and cruel sea?" These words, attributed to the most powerful caliph of medieval Islam, Umar Ibn al-Khattab (634-644), have led to a misunders...

La Mer Et Les Musulmans D'Occident Au Moyen Age: Viiie-Xiiie Siècle

By Picard Christophe, Christophe Picard, Christophe Picard

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C'est en général sous le terme de que l'on présente l'activité maritime islamique dans l'Occident médiéval. Pourtant, maîtres des deux rives du Maghreb et de la péninsule Ibérique pendant six siècl...

Edad Media siglos XI XV

By Michel Zimmermann, Picard Christophe, M Kaplan

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Sea of the Caliphs

By Christophe Picard

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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.