Roger Bruns Books

Julius Caesar

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A biography of the Roman general and statesman whose brillant military leadership helped make Rome the center of a vast empire.

Thomas Jefferson

By Roger Bruns

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A biography of the third President of the United States whose many achievements include the writing of the Declaration of Independence.

Abraham Lincoln

By Roger Bruns, Roger Bruns Arthur M. Jr. Schlesinger Roger Burns

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A biography of the sixteenth President of the United States whose term of office was served during the Civil War.

Bermuda

By Roger Bruns

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An introduction to the history, topography, economy, politics, industry, people, and culture of Bermuda.

DESERT HONKYTONK

By Roger A. Bruns, Roger Bruns

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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.