Patti Callahan Books

Becoming Mrs. Lewis

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"From New York Times bestselling author Patti Callahan comes an exquisite novel of Joy Davidman, the woman C. S. Lewis called 'my whole world.' When poet and writer Joy Davidman began writing lette...

Becoming Mrs. Lewis

By Patti Callahan

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Once Upon a Wardrobe

By Patti Callahan

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Once Upon a Wardrobe

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Surviving Savannah

By Patti Callahan

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Once Upon a Wardrobe

By Patti Callahan

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Becoming Mrs. Lewis Thorndike Press Large Print Christian Fiction

By Patti Callahan

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Coming Up for Air

By Patti Callahan Henry

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Once Upon a Wardrobe

By Patti Callahan

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Once Upon a Wardrobe

By Patti Callahan, Fiona Hardingham

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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.