David K. Johnson Books

The Lavender Scare: The Cold War Persecution of Gays and Lesbians in the Federal Government

By David K. Johnson

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The Lavender Scare: The Cold War Persecution Of Gays And Lesbians In The Federal Government

By David K. Johnson

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*Winner of the Randy Shilts Award in Gay Nonfiction*Winner of the Herbert Hoover Book Award in U.S. History*Winner of the Gustavus Myers Book Award in Human RightsNow an award-winning documentary f...

Lavender Scare

By David K. Johnson

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Lavender Scare

By David K. Johnson

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Lavender Scare

By David K. Johnson

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Buying Gay

By David K. Johnson

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Buying Gay: How Physique Entrepreneurs Sparked A Movement

By David K. Johnson

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Buying Gay

By David K. Johnson

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Heroes and philosophy

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Heroes and Philosophy

By William Irwin, David K. Johnson

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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.