Anthony John Harper Books

Sappho In The Shadows

By Anthony J. Harper

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German Secular Song Books of the Mid Seventeenth Century

By Anthony J. Harper, Anthony John Harper

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"In this book Anthony J. Harper first studies the songs of the two great models of the time, Martin Opitz and Paul Fleming, following this by an analysis of the song-books and collections from thre...

Song-books of Gottfried Finckelthaus

By Anthony J. Harper

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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.