John Keller Books

Cats Love Christmas Too: A Seasonal Celebration in Poetry and Prose

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Operating codes

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Upon moving to Sentinel House, five-year-old Matty and fifteen-year-old Graham encounter ghosts from a nearby abandoned military compound, but real trouble begins when their father is arrested for...

Espana En Su Literatura

By John Keller, Nicholson Barney Adams, Nicholson B. Adams

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Samuel Beckett and the primacy of love

By John Robert Keller

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Techniques and procedures for industrial security: property, processes, ideas.

By Keller John.

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Power in America

By John F. Keller

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Applied Aerospace and Defense Expert Systems

By John Keller, James Vedda, Keller John, Alton K. Marsh

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Buscalo Encuentralo Consiguelo

By John Keller

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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.