Christopher Haas Books

Alexandria in Late Antiquity

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Second only to Rome in the ancient world, Alexandria was home to many of late antiquity's most brilliant writers, philosophers, and theologians - among them, Philo, Origen, Arius, Athanasius, Hypat...

Shooting for Your Dreams

By Christopher Haas

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Documentary History of California

By Christopher Haas

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Alexandria in Late Antiquity

By Christopher Haas

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Alexandria in Late Antiquity

By Christopher Haas

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Reptile with a Grin

By Emily Fritz, Casey Fritz, Christopher Haas

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Reptile with a Grin

By Christopher Haas

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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.