John Butler Books

Whose Nose and Toes?

By John Butler, Butler John

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Wonders of spiritual unfoldment

By John Butler

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The Quest for Becket's Bones

By John R. Butler, John Butler

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In January 1888, workmen excavating the eastern crypt of Canterbury Cathedral uncovered the ancient bones of a tall, middle-aged man whose skull had seemingly been cleft by a sword. Could these be...

Transducers and Arrays for Underwater Sound

By Charles Sherman, John Butler, J. N. Bruneton

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An address to the Cocoa-Tree from a Whig. And a consultation on the subject of a standing-army, held at the King's-Arms Tavern, on the twenty-eighth day of February, 1763. The fifth edition .

By John Butler

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Welcome to the Jungle

By Huck Flyn, John Butler

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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.