Geoffrey Perret Books

Old Soldiers Never Die: The Life and Legend of Douglas MacArthur

By Geoffrey Perret

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Ulysses S. Grant:: Soldier & President

By Geoffrey Perret

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Based on extensive research, including material either not seen or not used by other writers, this biography explains for the first time how Grant's military genius ultimately triumphed as he creat...

A country made by war

By Geoffrey Perret

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Winged Victory

By Geoffrey Perret

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Days of sadness, years of triumph

By Geoffrey Perret, Geoffrey Perrett

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Old Soldiers Never Die

By Jeff Riggenbach

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Old Soldiers Never Die

By Jeff Riggenbach

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Ulysses S. Grant

By Geoffrey Perret

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Eisenhower

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Eisenhower

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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.