John Costanza Books

Creature Commandos

By John Costanza, Joe Kubert, Pat Broderick, Esphid Mahilum, Bob Hall, J. M. DeMatteis, John Kalisz, Ben Oda, Jerry Ordway, Shelly Leferman, Jerry Serpe, John Celardo, Robert Kanigher, Dan Spiegle, Adrienne Roy, Mike W. Barr, Fred Carillo, Milt Snapinn

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"In one of DC's strangest comics ever, a werewolf, a vampire, a gorgon, and Frankenstein's monster fight the German forces during World War II. Originally published in the early 1980s, The Creature...

Green Lantern Green Arrow

By Neal Adams, Dennis O Neil

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Archie's Big Book Vol. 3

By Archie Superstars

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ARCHIE'S BIG BOOK VOL. 3 is the latest of an all-new series of deluxe softcovers featuring the classic Archie stories in-and-out of Riverdale. A value at $19.99, this comic-trim-sized collection is...

Simpsons Comics

By John Costanza, Matt Groening, Ian Boothby

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65 Times Around

By John Costanza

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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.