Robert Bruce Spencer Books

Major Mass Market Merchandisers

By Robert Bruce Spencer

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The Truth About Muhammad

By Robert Bruce Spencer

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Stealth Jihad

By Robert Bruce Spencer

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Does America face a jihadist threat that's even bigger than terrorism? While our homeland security efforts are focused on preventing terrorist attacks, another jihadist threat is growing right here...

Did Muhammad Exist

By Robert Bruce Spencer

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This stunning book uncovers provocative evidence that forces us to ask: Did Muhammad, Islam’s founding prophet, even exist? It is a question that few have thought―or dared―to ask. But the widely...

Islam Unveiled

By Robert Bruce Spencer

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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.