Larry Selden Books

Angel Customers and Demon Customers

By Geoffrey Colvin, Larry Selden

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Killer customers

By Larry Selden

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Angel Customers Demon Customers

By Geoffrey Colvin

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Angel Customers & Demon Customers

By Geoffrey Colvin

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Angel Customers & Demon Customers

By Larry Selden Geoff Colvin

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One of the oldest myths in business is that every customer is a valuable customer. Even in the age of high-tech data collection, many businesses don't realize that some of their customers are deepl...

Angel Customers and Demon Customers revised Edition

By Larry Selden, Geoff Colvin

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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.