John Guaspari Books

I Know It When I See It

By John Guaspari

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I know it when I see it

By John Guaspari

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Customer Connection: Quality For The Rest Of Us

By Donald H. Weiss, John Guaspari, Weiss, Donald H., 1936-

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If you can read financial statements, you can understand what's really happening at the company you work for. You can also make smarter decisions about investing your hard-earned money.

Theory why

By John Guaspari

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The customer connection

By John Guaspari

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I Know It When I See It

By John Guaspari

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The Value Effect

By John Guaspari

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Through this ingenious, entertaining murder mystery format, The Value Effect helps readers solve a real-world business mystery: why haven't our Next Big Thing efforts worked out as well as we...

Otherwise Engaged

By John Guaspari

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Otherwise Engaged

By John Guaspari

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El Efecto Valor

By John Guaspari

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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.