Hal Marcovitz Books

Profiles the lives and careers of the sisters who have had sensational success in the world of professional tennis, looking at their childhoods, professional achievements, and interests outside of...

Teens and cheating

By Hal Marcovitz

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Teens and LGBT issues

By Hal Marcovitz

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Teens race

By Hal Marcovitz

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"No issue seems to divide Americans as much as race. Nearly five decades after the adoption of federal civil rights laws, Americans are still wrestling with such issues as interracial marriage and...

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.