Mark Verstegen Books

Core performance

By Mark Verstegen

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Every day is game day

By Mark Verstegen

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"Noted sports performance expert and bestselling author of Core Performance, Verstegen reveals the training program he uses with elite athletes and U.S. Special Operations Forces. As founder and pr...

Core Performance

By Mark Verstegen

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Core Performance Golf

By Mark Verstegen, Pete Williams

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Core performance endurance

By Mark Verstegen

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The Core Performance

By Mark Verstegen, Pete Williams

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Core Performance Women

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Core Performance Women

By Mark Verstegen

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World-renowned strength and performance coach Mark Verstegen has trained top athletes and countless workaday warriors into the best shape of their lives. He's spent years developing a proven system...

Core performance essentials

By Mark Verstegen

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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.