Philip Keller Books

Meditations for the Soul

By Philip Keller

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Keller's math SAT game plan

By Philip Keller

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Devised for high school students who want to improve their math SAT scores, this study guide offers a comprehensive strategy for approaching the test. Concise and efficiently organized, this book p...

The New Math Sat Game Plan The Strategic Way To Score Higher

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Advanced Math for Young Students

By Philip Keller

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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.