Peter G. Tsouras Books

On 22 June 1941, the German army invaded the Soviet Union, one hundred fifty divisions advancing on three axes in a surprise attack that overwhelmed and destroyed whatever opposition the Russians w...

Military Quotations from the Civil War

By Peter G. Tsouras

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Civil War Quotations

By Peter G. Tsouras

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Changing orders

By Peter Tsouras

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A grim, but fascinating pageant. This is the story of the world's armies from the end of the Second World War - their development and progress, their objectives and performance, and their strategie...

Dixie Victorious

By Peter G. Tsouras

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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.