John Heidenry Books

Zero at the Bone: The Playboy, the Prostitute, and the Murder of Bobby Greenlease

By John Heidenry

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Their s Was the Kingdom

By John Heidenry

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Test your sex I.Q.

By Charles Murphy, John Heidenry

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What Wild Ecstasy: The Rise and Fall of the Sexual Revolution

By John Heidenry

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In many respects, the Sexual Revolution was the catalyst that set in motion social life as we know it at the end of the twentieth century. Yet many of us have difficulty remembering - or never knew...

What Wild Ecstasy

By John Heidenry

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The boys who were left behind

By John Heidenry

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Gashouse Gang

By John Heidenry

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Zero at the Bone

By John Heidenry

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What Wild Ecstasy

By John Heidenry

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Gashouse Gang

By John Heidenry

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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.