Helen J. Nicholson Books

The Crusades

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"Covering the classic crusades to the Holy Lands and the taking and defending of Jerusalem, Nicholson also gives equal treatment to the Requonquista of the Iberian peninsula, the subjugation and co...

Medieval Warfare: Theory and Practice of War in Europe, 300-1500

By Helen J. Nicholson, Helen Nicholson

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"Warfare in medieval times was never static or predictable - although there were ideals and conventions to follow, in the field commanders had to use their initiative and adapt to the needs of the...

Medieval Warfare: Theory and Practice of War in Europe, 300-1500

By Helen J. Nicholson, Nicholson Helen J, Helen Nicholson

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Love, War and the Grail: Templars, Hospitallers and Teutonic Knights in Medieval Epic and Romance 1150-1500

By Helen Nicholson, Helen J. Nicholson

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Templars, Hospitallers, and Teutonic Knights

By Helen J. Nicholson

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Templars Hospitallers and Teutonic Knights

By Helen J. Nicholson

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Knights templar

By Helen J. Nicholson, Helen Nicholson

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The Knights Templar on trial

By Helen J. Nicholson

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Chronicle of the Third Crusade

By Helen J. Nicholson

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The Knights Templar

By Helen J. Nicholson

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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.