Petra Mathers Books

Frannie's Fruits

By Leslie Kimmelman, Petra Mathers, Leslis Kimmelman

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A little girl and her family operate a fruit and vegetable stand near the beach with the help of their dog Frannie.

Sophie and Lou

By Fran Martin, Petra Mathers

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Retells ten traditional myths from various northwest coast Indian tribes.

Maria Theresa

By Petra Mathers

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A restless young chicken leaves the coop and joins the circus.

Theodor and Mr. Balbini

By Petra Mathers

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Soon after the kindly Mr. Balbini discovers that his dog Theodor can talk, he finds himself bullied by the demanding canine and yearns for a more traditional pet.

Maria Theresa

By Petra Mathers

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Sophie and Lou

By Petra Mathers

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Shy Sophie, enticed by the dancing that she sees in the studio across the street, sets out to learn on her own.

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.