Mark T. Sullivan Books

Triple Cross

By Mark T. Sullivan

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Rogue

By Mark T. Sullivan

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Two years ago, Robin Monarch was a top level CIA operative, perhaps the best they had when it came to black bag operations. Then one day, in the middle of an operation, with his team around him in...

Triple Cross

By Mark Sullivan

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The purification ceremony

By Mark T. Sullivan

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Ghost dance

By Mark T. Sullivan

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Ghost Dance

By Mark Sullivan, Mark T. Sullivan

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The purification ceremony

By Mark T. Sullivan

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Ghost Dance Prepack

By Mark T. Sullivan

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Ghost Dance

By Mark T. Sullivan, Sullivan, Mark T.

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Outdoorsman and documentary filmmaker Patrick Gallagher had torpedoed a promising career through self-destructive self-pity and procrastination. Now he seeks redemption in tiny, isolated Lawton, Ve...

Labyrinth

By Mark T. Sullivan

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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.