Jef Sadzinski Books

Villainous

By Giovanna T. Orozco, Stonie Williams, Jef Sadzinski, Chris Fernandez

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Tilly, one of the newest super-powered humans to join the Coalition of Heroes, is doing her best to navigate the dizzying world of superheroes. Working with her idols should be a dream come true, b...

Show'S End Vol. 1

By Anthony Cleveland, Mad Cave Studios, Julian Gonzalez, Jef Sadzinski

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Equal parts brutal and beautiful, Show’s End takes place in Georgia during the 1920s and follows Loralye, a 12-year-old runaway seeking refuge with a traveling group of freak show performers. At fi...

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.