John Leventhal Books

My Partner, My Enemy

By John Leventhal, John Michael Leventhal

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"The problem of domestic violence and partner abuse knows no bounds, can affect anyone, and when kept silent and in the dark can become deadly. Hon. John Leventhal presided over the Brooklyn Felony...

My Partner, My Enemy

By John Leventhal

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Strangers World

By John Leventhal, Patty Larkin

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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.