Peter B. Gillis Books

Anything can happen in WHAT IF? - and this is the Omnibus to prove it! Imaginative creators line up to explore alternate possibilities in unexpected ways - featuring amazing, incredible and uncanny...

Marvel Verse

By Ed Hannigan, Peter B. Gillis, Jeff Parker

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WHAT IF? CLASSIC: THE COMPLETE COLLECTION VOL. 3

By Mark Gruenwald

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Collects What If? (1977) #24-35. Classic stories reimagined in wild and wonderful ways by legendary creators! Imagine…what if Gwen Stacy had lived? What if Captain America was elected president? W...

BLACK FLAME Archive 02

By Don Lomax, Peter B. Gillis, Tom Sutton

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BLACK FLAME Archive 03

By Don Lomax, Peter B. Gillis, Tom Sutton

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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.