Randy Martinez Books

Darth Vader

By Randy Martinez, Jason Fry, Scholastic Staff

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Darth Vader

By Randy Martinez, Jason Fry, Rick Burchett

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Sketch card mania

By Randy Martinez

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Creature features

By Randy Martinez

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Sketch Card Mania

By Randy Martinez

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In this age of digital everything, presenting someone with an original, hand-drawn piece of art makes a big impression. So it's no wonder sketch cards (trading cards featuring one-of-a-kind artwork...

Creature Features

By Randy Martinez

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Prepare to scare . . .Open this book, grab a pen, and give life to the monsters that lurk in your imagination. Creature Features shows you how to draw all things creepy, slimy and fantastical. Mor...

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.