Joop Fenstra Books

Down Syndrome Behind The Dykes: Research In The Netherlands

By A. Vermeer, Adri Vermeer, GRAAF, Erik A. B. De; Vermeer, Adri;Heymans, Hugo S. A.;Schuurman, Martin I. M., Erik A.B. De Graaf, H.A. Heymans, Joop Fenstra, Hugo S. A. Heymans, Ulrike Volckers, Luna Negra

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"In The Netherlands researchers of Down syndrome are in a position that is probably unique in the world. Virtually all children born with Down syndrome are on file with the Dutch Down Syndrome Foun...

Zelfhypnose ... Je Kunt Het Zelf Doen

By Joop Fenstra

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Zelfhypnose

By Joop Fenstra

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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.