Gordon McAlpine Books

Meet Edgar and Allan Poe -- twelve-year-old identical twins, the great-great-great-great-grandnephews of Edgar Allan Poe. They look and act so much alike that they're almost one mischievous, prank-...

Pet and the Pendulum

By Gordon McAlpine, Sam Zuppardi

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Once upon a Midnight Eerie

By Gordon McAlpine, Sam Zuppardi

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The Telltale Start

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The pet and the pendulum

By Gordon McAlpine

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Back in Baltimore, twelve-year-old identical twins Edgar and Allan think they have encountered the ghost of their great-great-great-great granduncle, Edgar Allan Poe, asking them to solve his murde...

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.