Cathy Warren Books

Saturday Belongs to Sara

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Sara and her mother set aside Saturday as a special day to spend time together doing the things they enjoy most, but then Sara discovers that they must share their day with someone else.

Roxanne Bookman: Live at Five!

By Cathy Warren

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Feeling like a loser compared to the other talented members of her family, ten-year-old Roxanne hopes to find success competing with her class in a television quiz show.

Victoria's ABC adventure

By Cathy Warren

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A little brown snake saves her family after pandemonium at a cookout endangers their lives. Letters of the alphabet are highlighted.

Victoria's ABC adventure

By Cathy Warren

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A little brown snake saves her family after pandemonium at a cookout endangers their lives. Letters of the alphabet are highlighted.

The ten-alarm camp-out

By Cathy Warren

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An armadillo family innocently causes havoc during their camp-out.

Fred's first day

By Cathy Warren

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After a few false starts, Fred's first day at nursery school turns out to be just right.

Edexcel GCSE History B schools history project

By Cathy Warren

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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.