N. G. L. Hammond Books

Plutarch and Arrian have contributed more than any other ancient authors to our picture of Alexander the Great, but since they wrote four or more centuries after his death the value of what they sa...

Sources for Alexander the Great

By N. G. L. Hammond

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Alexander the Great

By N. G. L. Hammond

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x, 358 pages : 25 cm

Philip of Macedon

By N. G. L. Hammond

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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.