John A. A. Goodall Books

God's House at Ewelme

By John A. A. Goodall, English Heritage UK John Goodall

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"God's House, at Ewelme, is a survival from England's late medieval past: a well documented and preserved chantry foundation established in 1437 by William and Alice de la Pole, then Earl and Count...

Portchester Castle

By John A. A. Goodall

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Whitby Abbey

By John Goodall

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Richmond Castle Easby Abbey Colour Handbook

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Warkworth Castle and Hermitage

By John A. A. Goodall

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God s House at Ewelme

By John A. A. Goodall

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Portchester Castle Hampshire

By John A. A. Goodall

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Ashby de la Zouch Castle and Kirby Muxloe Castle

By John A. A. Goodall, English Heritage Staff

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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.