Thera S. Callahan Books

All Wrapped Up

By Thera S. Callahan

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All wrapped up

By Thera S. Callahan

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When a brother and sister run out of tape while tryng to wrap their dad's birthday present, they use various other sticky substances to make the paper stick.

UN Regalo Bien Envuelto Rookie Espanol

By Thera S. Callahan

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UN Regalo Bien Envuelto

By Isabel Mendoza, Thera S. Callahan

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Quite Enough Hot Dogs and Other Silly Stories (A Rookie Reader Treasury)

By Mike Cressy, Joy N. Hulme, Thera S. Callahan, Justine Korman

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Can you have too many hot dogs?This book is a collection of four humorous stories, including stories about bubbles, birthday gifts, being sick, and turning into a hot dog.

All Wrapped Up

By Thera S. Callahan

Average: 0.00, 0 Ratings

All Wrapped Up

By Thera S. Callahan

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Sara Joins the Circus

By Thera S. Callahan

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Un Regalo Bien Envuelto

By Thera S. Callahan

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Sara joins the circus

By Thera S. Callahan

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Sara wants to join the circus so she practices and prepares and, after many weeks, she takes her show on the road.

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.