Dan Marzollo Books

When he plays football at school, Freddy has trouble avoiding fights, because he feels that the teams are uneven and he dislikes it when Mark teases him, so he tries to use his anger to play better...

Hockey Hero

By Jean Little, Dan Marzollo, Jean Marzollo

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When Hal moves to a new town where he is no longer the star hockey player, he learns that scoring goals is not the only way to be a star.

Football Friends

By Jean Little, Dan Marzollo, Dave Marzollo

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Basketball Buddies

By Jean Little

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Baseball Brothers

By Jean Little, Dan Marzollo, Dave Marzollo

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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.