Gillies John Books

A guide to compassionate care of the aging

By Gillies John, Gillies John 1925 .

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The Soviet Union

By Gillies John

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Discusses the geography, history, economy, family and school life, customs, and other aspects of life in the Soviet Union and examines the experiences of Soviet emigrants in the United States.

Senor Alcalde

By Gillies John

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A biography of the Mexican-American mayor of San Antonio, Texas, including a chapter in which the mayor offers advice to young people who want to make the most of their education and future careers.

The New Russia

By Gillies John

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Provides a description of the Russian Federation, from a social and geographical perspective.

A guide to caring for and coping with aging parents

By Gillies John

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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.