John Lavelle Books

First Aid for the COMLEX First Aid Series

By Stockton M. Mayer, Zachary Nye, John M. Lavelle, Rachel Laven

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First Aid for the COMLEX, Second Edition

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Candor

By Pam Bachorz, John Lavelle

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Nate the Great More Collected Stories

By Marjorie Weinman Sharmat, John Lavelle

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Nate the Great Collected Stories: Volume 1

By Marjorie Weinman Sharmat

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Nate the GreatWhen Nate gets an urgent call from Annie about a lost picture, he immediately plunges into his new and baffling case with the cool detachment of a Sam Spade. Getting all the facts, as...

Nate the Great Collected Stories: Volume 2

By Marjorie Weinman Sharmat

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A new collection of classic stories from Nate the Great and his trusty companion Sludge.Volume 2 includes:Nate the Great and the Phony ClueEarly one morning, a torn slip of paper with the mysteriou...

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.