Christian Laes Books

"The economic success of the Roman Empire was unparalleled in the West until the early modern period. While favourable natural conditions, capital accumulation, technology and political stability a...

Work, labour, and professions in the Roman world

By Christian Laes, Koenraad Verboven

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Disabilities in Roman antiquity

By C. F. Goodey, Christian Laes, Martha L. Rose

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"This is the first volume ever to systematically study the subject of disabilities in the Roman world. The contributors examine the topic a capite ad calcem, from head to toe. Chapters deal with me...

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.