David A. Adler Books

Cam Jansen and the Secret Service Mystery 26

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No mystery is too great for super-sleuth Cam Jansen and her amazing photographic memory! Mysteries follow super-sleuth Cam Jansen everywhere she goes...even to the school library. It is a big day a...

Cam Jansen: Cam Jansen and the Mystery Writer Mystery 27

By David A. Adler

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No mystery is too great for super-sleuth Cam Jansen and her amazing photographic memory!Mysteries follow super-sleuth Cam Jansen everywhere she goes...even to the book fair. Cam Jansen, her friends...

Cam Jansen: the Green School Mystery 28

By David A. Adler

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No mystery is too great for super-sleuth Cam Jansen and her amazing photographic memory! Mysteries follow super-sleuth Cam Jansen everywhere she goes...even to the school Green Day assembly. For ea...

Young Cam Jansen and the Knock, Knock Mystery

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Cam, her best friend Eric, and Eric’s mom are spending the day with Eric’s grandparents. But Grandpa and Grandma seem too tired to visit. Every so often, a knock at the door wakes them up. But when...

Cam Jansen prepack

By David A. Adler

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SCH Young Cam Jansen 4c bulk pack

By David A. Adler

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Young Cam Jansen and the Double Beach Mystery

By David A. Adler

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Cam Jansen has a great time looking for shells on the beach with her friend Eric and her aunt Molly. But when they're done, Cam's mother is nowhere in sight! She was just sitting under a red umbrel...

Cam Jansen and the first day of school mystery

By David A. Adler

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On her first day of fifth grade, Cam Jansen uses her photographic memory to help the police find a car thief. Includes a memory game.

Cam Jansen and the Spaghetti Max Mystery

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No mystery is too great for super-sleuth Cam Jansen and her amazing photographic memory!Mysteries follow super-sleuth Cam Jansen everywhere she goes… even to the airport. Cam and Eric go with her f...

Cam Jansen and the Joke House Mystery

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The latest installment in the beloved Cam Jansen mystery chapter book series from David A. Adler! Aunt Molly has entered a joke-telling contest at a local comedy club and Cam, her best friend Eric,...

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.