Eric Marcus Books

Is It A Choice? Answers To The Most Frequently Asked Questions About Gay & Lesbian People, Third Edition

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The Answers To All The Questions You've Ever Had About Homosexuality But Were Afraid To Ask Are Finally In One Book, Is It A Choice? In This Newly Revised And Updated Edition, Eric Marcus Provides...

Is It A Choice? 3rd Ed.: Answers To Three Hundred Of The Most Fre

By Eric Marcus

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The answers to all the questions you've ever had about sexual orientation but were afraid to ask. Eric Marcus provides insightful, no-nonsense answers to hundreds of the most commonly asked questio...

Making Gay History

By Eric Marcus

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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.