Ralph E. Johnson Books

A Little Java, A Few Patterns

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Matthias Felleisen and Daniel Friedman use a small subset of Java to introduce pattern-directed program design. With their usual clarity and flair, they gently guide readers through the fundamental...

Implementing Application Frameworks

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Domain Specific Application Frameworks

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CO

By Ralph E. Johnson Jr.

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Little Java a Few Patterns

By Matthias Felleisen, Duane Bibby, Daniel P. Friedman, Ralph E. Johnson

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Little Java a Few Patterns

By Matthias Felleisen, Duane Bibby, Daniel P. Friedman, Ralph E. Johnson

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Building Application Frameworks

By Ralph E. Johnson

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Poems by REJ

By Ralph E. Johnson

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Poems by REJ

By Ralph E. Johnson

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The Curse of Serendipity

By Ralph E. Johnson

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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.