John Mullarkey Books

On May 31, 1889, as the waters rise in Johnstown, Pennsylvania, Sarah Beth, her mother, and Vincent, a boy she likes, struggle to save what they can from the flooding but when the dam collapses the...

Mary molds a monster

By Lisa Mullarkey

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Sixth-grader Maggie is stuck with insufferable Jacob on a class writing project, and when they get into an argument over who really wrote the novel Frankenstein, they suddenly find themselves in Sw...

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.