Jennifer Roy Books

Playing Atari with Saddam Hussein

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For forty-two days in 1991, eleven-year-old Ali Fadhil and his family struggle to survive as Basra, Iraq, is bombed by the United States and its allies.

Graphing in the Desert Math All Around

By Jennifer Rozines Roy, Gregory Roy

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Yellow star

By Jennifer Rozines Roy

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From 1939, when Syvia is four and a half years old, to 1945 when she has just turned ten, a Jewish girl and her family struggle to survive in Poland's Lodz ghetto during the Nazi occupation.

Trading faces

By Julia DeVillers

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When seventh-grade twins Payton and Emma switch places, they shake up the social hierarchy at their new middle school.

Times squared

By Julia DeVillers

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Identical twins Payton and Emma have vowed never to switch places again, but they face an emergency while the mathletes and Drama Geckos are all in New York City together.

Take two

By Julia DeVillers

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Identical twins Payton and Emma continue to navigate life in middle school as they serve their punishment for having fooled people by trading places, and they learn that their own identities are us...

Take two

By Julia DeVillers

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Times squared

By Julia DeVillers

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Identical twins Payton and Emma have vowed never to switch places again, but they face an emergency while the mathletes and Drama Geckos are in New York City together. The coauthor is Jennifer Roy....

Times Squared

By Julia DeVillers

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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.