J. A. (John Alexander) Guy Books

My Heart is My Own: The Life of Mary Queen of Scots

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A dramatic reinterpretation of the life of Mary, Queen of Scots. John Guy returns to the archives to explode the myths and correct the inaccuracies that surround this most fascinating monarch. He a...

Court of Star Chamber and Its Records of the Reign of Elizabeth Public Record Office Handbooks

By J. A. John Alexander Guy, John A. Guy

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The Tudors: A Very Short Introduction

By J. A. John Alexander Guy

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Tudor England

By J. A. John Alexander Guy, John Guy

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The Public Career of Sir Thomas More

By J. A. John Alexander Guy

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Thomas More

By J. A. John Alexander Guy

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Thomas More

By J. A. John Alexander Guy

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Queen of Scots

By J. A. John Alexander Guy, J. A. Guy

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A new historian of Mary Queen of Scots draws on new sources to shatter various myths surrounding this odd monarch and uncover some of the scandals and political machinations underpinning, and under...

The cardinal's court

By J. A. John Alexander Guy

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Politics, law and counsel in Tudor and early Stuart England

By J. A. John Alexander Guy

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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.