Henry Porter Books

Am elften Tag zur elften Stunde

By Henry Porter

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The two angry women of Abington, 1599.

By Porter Henry

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Remembrance Day

By Porter Henry, Henry Porter

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"For Irish-born Constantine Lindow, it is really just an unlucky accident that marks the beginning of his troubles, a highly unfortunate case of wrong place, wrong time. While waiting for his broth...

Lies, damned lies, and some exclusives

By Porter Henry, Henry Porter

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A Spy s Life

By Porter Henry, Henry Porter

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Remembrance Day

By Henry Porter

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The Dying Light

By Henry Porter

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Rememberance Day

By Henry Porter

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Remembrance Day

By Henry Porter

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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.