David C. Downing Books

"Other biographies of Lewis explore his childhood or his dramatic conversion to Christianity. But it was the rarely discussed period from Lewis's childhood to his early thirties that took him on a...

Into the region of awe

By David C. Downing

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Explores mysticism as a part of C.S. Lewis's faith and writing. Shows the influence on Lewis by mystical writers of his own day and threads of mysticism evident in Lewis's works, including the Spac...

NTC's pocket guide for doubtful spellers

By David C. Downing

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303 dumb spelling misstakes sic -- and what you can do about them

By David C. Downing

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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.