Marios Costambeys Books

"At its height, the Carolingian empire spanned a million square kilometres of Western Europe--from the English Channel to central Italy and northern Spain, and from the Atlantic to the fringes of m...

Power and Patronage in Early Medieval Italy

By Marios Costambeys

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Documentary culture and the laity in the early Middle Ages

By Adam J. Kosto, Marios Costambeys, Matthew Innes, Warren C. Brown

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"Many more documents survive from the early Middle Ages than from the Roman Empire. Although ecclesiastical archives may account for the dramatic increase in the number of surviving documents, this...

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.