Gillian Gaar Books

100 things Beatles fans should know do before they die

By Gillian G. Gaar

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Nirvana

By Cross Charles R.

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"Nirvana formed in 1987, released their first LP in 1989, and unintentionally tore the music world asunder two years later with the video and single for "Smells Like Teen Spirit." At the time, MTV...

Sgt Pepper at Fifty

By Gillian G. Gaar, Mike McInnerney, Bill DeMain

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Green Day

By Gillian G. Gaar

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BRUCE SPRINGSTEEN Y LA E STREET BAND

By GILLIAN GAAR

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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.