Gregory Hill Books

This text provides preparation for taking the CLEP Calculus test to earn college credit. It includes free online diagnostic to pinpoint strengths & weaknesses, comprehensive review with test-taking...

Trouble, trouble, trouble

By Karl C. Sandberg

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The death of the king's beloved cow means certain death for the messenger bringing that bad news. Is it luck or cunning that saves him?

How to Sell Your Car for More Than Its W

By Gregory C. Hill, Gregory Hill

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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.