Porter Henry Books

Improving Efficiency in the Small Office

By Porter Henry, Joe Kish

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The two angry women of Abington, 1599.

By Porter Henry

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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 A Spy s life Empire state

By Porter Henry

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A UN plane crashes in mysterious circumstances at La Guardia airport, New York. The only survivor is former British spy Robert Cope Harland. Unwittingly he is pulled into a world of relentless intr...

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.