Guillem March Books

Gotham City sirens

By Guillem March, Paul Dini, Tony Bedard

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Catwoman, Poison Ivy, and Harley Quinn are tired of playing by other people's rules. As their alliance with the Riddler continues, they will do anything to find out which villain is targeting them...

Songs of the Sirens. Paul Dini Guillem March

By Paul Dini

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SUMMER MUSE 02

By March Guillem

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SUMMER MUSE 3

By Guillem March

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Monika 02. Vanilla Dolls

By Thilde Barboni Guillem March

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MONIKA OBRA COMPLETA

By MARCH GUILLEM

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The Dream 1. Jude

By Jean Dufaux, Guillem March

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Karmen

By Guillem March

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SOFIA ANA Y VICTORIA

By GUILLEM MARCH

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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.