John Pennisi Books

Believe Live Think

By John Pennisi, Heather Macy

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Gotham Baseball

By Todd Radom, Marty Appel, John Pennisi, Mark C. Healey

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Gotham Baseball: New York’S All-Time Team

By Marty Appel, Mark C. Healey, Todd Radom, John Pennisi

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"The Big Apple's greatest squad . . . Selecting either a Brooklyn Dodgers, New York Giants, New York Yankees or New York Mets player for each position." --Long Island Herald Baseball may be the gre...

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.