John Humphrey Books

Corporate restructuring

By Humphrey John

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Touchdown pass

By Clair Bee

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In the process of learning to go beyond himself and to reach out to others, high school star football player Chip Hilton uncovers an act of sabotage at the local pottery.

The sportsman head to toe

By John Humphrey

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The administration of justice

By John A. Humphrey

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Too loud?

By John Humphrey

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A Texas Odyssey

By John Humphrey

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Comanche Epitaph

By John Humphrey

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Close Up and Macro Photography

By John Humphrey

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Profits from Improved Productivity

By John Humphrey, Fiona Halse

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Too loud?

By John Humphrey

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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.