John A. Halloran Books

With 6,400 entries, this is the most complete available lexicon of ancient Sumerian vocabulary. It replaces version 3 of the author's Sumerian Lexicon, which has served an audience of over 380,000...

Sumerian Lexicon

By John A. Halloran

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How the Sumerians Became Rich

By John Alan Halloran

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Student Resource CD-ROM for Financial Management

By John A. Halloran, Howard P. Lanser, Wilbur G. Lewellen

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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.