Glenn Whitmore Books

Superman

By John Costanza, Glenn Whitmore, Louise Simonson, Dan Jurgens, Tom Grummett, Jackson Guice, Jerry Ordway, Brett Breeding, Albert De Guzman, Bill Oakley, Roger Stern, Jon Bogdanove

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"Brainiac returns to invade the earth with his ultimate weapon, Warworld, a planet-sized satellite built for destruction. With the help of super-powered friends like Wonder Woman, The Flash, Green...

The death of Superman

By John Costanza, Glenn Whitmore, Dan Jurgens, Brett Breeding, Gene D Angelo, Jon Bogdanove

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Super Suckers 13

By Jenn Lloyd, Jeff Shultz, Glenn Whitmore, Kevin Bonani, Darin Henry

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Sabrina the Teenage Witch Annual Spectacular 2023

By Jim Amash, Glenn Whitmore, Jack Morelli, Holly G.Holly, Jamie L. Rotante L. Jamie

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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.