W. Mark Ormrod Books

Reign of Edward II

By Alison Marshall, Gwilym Dodd, Anthony Musson

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Medieval Petitions

By W. Mark Ormrod, Gwilym Dodd, Anthony Musson

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Fourteenth Century England VII

By W. Mark Ormrod, Andrew Ayton, Alison McHardy, Benoit Grevin, Christopher Phillpotts

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"Henry V (1413-22) is widely acclaimed as the most successful late medieval English king. In his short reign of nine and a half years, he re-imposed the rule of law, made the crown solvent, decisiv...

Henry V

By Gwilym Dodd

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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.