Barbara SULLIVAN Books

First Born, Second Born

By Barbara A. Sullivan

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Marvin Redpost

By Louis Sachar

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A small incident during recess threatens to turn nine-year-old Marvin into the outcast of his third-grade class.

Marvin Redpost

By Louis Sachar

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After Casey Happleton tells him that if he kisses his elbow he will turn into a girl, nine-year-old Marvin experiments and finds himself very confused about his identity.

Marvin Redpost

By Louis Sachar

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Marvin is pleased when his teacher asks him to take care of her dog while she's away, but he soon finds that there's more pressure involved than he likes.

Puppy and Friends Color n Contrast Crib Book

By Playskool Books

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Knowing Numbers

By Playskool, Playskool Books

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Understanding Opposites: A Tab Board Book

By Playskool

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Gender Politics and Citzenship in the 1990 s

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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.