Gloria Koster Books

The peanut free cafe by Gloria Koster illustrated by Maryann Cocca Leffler.

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When a new classmate has a peanut allergy and has to sit in a special area of the lunchroom, Simon reconsiders his love for peanut butter.

Little Red Ruthie

By Gloria Koster

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"I am going to eat you up! With jars full of sour cream and applesauce in her basket, Little Red Ruthie is on her way to Bubbe Basha's house to make latkes for Hanukkah! But along the path she meet...

LITTLE RED RUTHIE

By Gloria Koster, Sue Eastland

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Little Red Ruthie

By Gloria Koster, Sue Eastland

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The King with a Horse s Ears

By Gloria Koster, Cesar Samaneigo

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Grains Are Good for You

By Gloria Koster

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Vegetables Are Good for You

By Gloria Koster

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Traditions and Celebrations

By Charles C. Hofer, Gloria Koster, Ailynn Collins, Ranjeeta Ramkumar, Nicole A. Mansfield

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Traditions and Celebrations

By Charles C. Hofer, Gloria Koster, Ailynn Collins, Ranjeeta Ramkumar, Nicole A. Mansfield

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Rosh Hashanah

By Gloria Koster

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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.