Peter Calloway Books

Batman

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The Joker shares five stories from his cell at Arkham Asylum, including tales about the Mad Hatter, The Riddler, Killer Croc, Clayface, and Harley Quinn.

Gotham City Sirens

By Peter Calloway

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"Together, Catwoman, Harley Quinn and Poison Ivy are three of Gotham City's most powerful quasi-reformed criminals. But when Harley stages a riot in Arkham to reach her former employer and lover th...

Gotham City Sirens Book Two

By Peter Calloway

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Together, Catwoman, Harley Quinn and Poison Ivy are three of Gotham City's most powerful quasi-reformed criminals and together they spark scandal wherever they go.   Poison Ivy has long charme...

Last Space Race

By Mike Marts, Alexandre Shibao, Peter Calloway

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Shadow Doctor

By Georges Jeanty, Peter Calloway

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Gotham City Sirens - Division

By Peter Calloway

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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.