John Gilstrap Books

“Gilstrap pushes every thriller button.” —San Francisco Chronicle   Special Forces veteran Jonathan Grave is the hunter—and the hunted—in John Gilstrap’s el...

Total Mayhem

By John Gilstrap

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In bestselling author John Gilstrap’s ticking time bomb of a thriller, freelance operative Jonathan Grave penetrates a terrorist cell to stop the detonation of total mayhem on home ground . ....

Nathan's Run

By John Gilstrap

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THE SENSATIONAL AWARD-WINNING THRILLER   “IMPRESSIVE AND PROVOCATIVE . . .VASTLY ENTERTAINING.” –San Francisco Chronicle   It begins with a savage killing at a sub...

Hellfire

By John Gilstrap

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“A great hero, a really exciting series.” —Joseph Finder   For hostage rescue specialist Jonathan Grave, every mission is a matter of life or death. But he faces his most per...

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.