Tess Callahan Books

April & Oliver

By Tess Callahan

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April Oliver

By Tess Callahan

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April and Oliver

By Tess Callahan

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"The story of April and Oliver, two inseparable childhood friends whose existences again collide with the sudden death of April's younger brother"--Provided by publisher.

April Oliver

By Tess Callahan

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April and Oliver

By Tess Callahan

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April and Oliver

By Tess Callahan

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Dawnland

By Tess Callahan

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Dawnland

By Tess Callahan

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April & Oliver

By Tess Callahan

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April and Oliver have been soul mates since childhood, and the attraction between them has always been palpable. Now, years after being completely inseparable, they have become strangers, but...

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.