Julie Ferris Books

Galaxy Getaway Math for Martians

By Julie Ferris

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Shakespeare s London Sightseers

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Galaxy Getaway Mathematics for Martians

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Planet Omicron Mathematics for Martians

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Everyday Life in the Ancient World

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California Gold Rush

By Julie Ferris

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Presents a look at the sites and society that existed in San Francisco during the time of the Gold Rush in the 1850s.

Ancient Greece

By Julie Ferris

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A tour of Greece in the time of Pericles, examining the theater, Acropolis, countryside, food and drink, marketplace, clothing, methods of travel, Olympics, and more.

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.