Helena Katz Books

Gangsters I

By Cat Klerks, Helena Katz, Nate Hendley

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Gangsters II Amazing Stories

By Helena Katz, Art Montague

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Turf Wars and Power Struggles of Gangland

By Helena Katz, Valerie Green, Art Montague

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Book has not been published and will not be published.

Frommer s Far and Wide

By Helena Katz, Andrew Hempstead, Patricia Gajo, Lucas Aykroyd, Pamela Cuthbert

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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.