John Vornholt Books

Knock on Wood

By John Vornholt

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Nemesis Star Trek Nemesis

By John Vornholt

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Starfleet Academy

By John Vornholt, Esther M. Friesner

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Leonard McCoy was a medical student at Starfleet Academy looking forward to the winter break. He was just trying to have some fun when a football game on Academy grounds got out of hand, and all th...

Mind Meld

By John Vornholt

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Halloween invaders

By John Vornholt, Esther M. Friesner

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When her powers drain away, rendering her a jellylike creature, Alex struggles to get home to recover, but is tracked by half of Paradise Valley, who believe her to be an alien. When her powers dr...

Coyote Moon

By John Vornholt

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Buffy and her friends Xander and Willow visit a carnival for fun and relaxation. They are surprised to learn of the carnival's deadly secrets.

Insurrection

By John Vornholt

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Haunted house hijinks

By John Vornholt, Esther M. Friesner

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Behind Enemy Lines The Dominion War Book 1

By John Vornholt

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Tunnel Through the Stars

By John Vornholt

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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.