Katherine Noll Books

What Your Puffle Says About You

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The Epic Official Guide To Disney Club Penguin

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Mayhem in Miami 2 Aly and Aj s Rock N Roll Mysteries

By Katherine Noll, Tracey West

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While enjoying Miami, Florida, in the company of two male models and rehearsing for an upcoming concert, singer/actor sisters Aly & AJ investigate who sabotaged the designer "mood tops" they wore i...

Singing in Seattle

By Katherine Noll

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In Seattle to judge a young songwriters competition and perform one of the winner's songs in concert, Aly & AJ also try to learn who stole a promising contestant's notebook of lyrics at the start o...

Nashville nights

By Katherine Noll

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In Nashville for the next stop on their concert tour, Aly and AJ meet the Walker Sisters, who ask them to be in a video, but when the digital files of the video are stolen, Aly and AJ must find the...

The ultimate official guide to Club Penguin

By Katherine Noll

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Secret agent handbook

By Katherine Noll

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Disney Club Penguin

By Katherine Noll

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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.