Kees Vellekoop Books

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By Ingrid Kiewik, Heleen Sancisi Weerdenburg, Kees Vellekoop

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The Liber Ordinarius of the Chapter Church of Saint Saviour at Utrecht

By Ike De Loos, Louis Van Tongeren, Gisela Gerritsen Geywitz, Kees Vellekoop

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"The Ordinal of St Saviour's or Oldminster, which dates from the first half of the fourteenth century, is a representation of the course of the liturgy as celebrated daily in one of the oldest chap...

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.