Deborah E. Harkness Books

Shadow of Night

By Deborah E. Harkness

Average: 0.00, 0 Ratings

A Discovery of Witches

By Deborah E. Harkness

Average: 0.00, 0 Ratings

The Jewel House: Elizabethan London and the Scientific Revolution

By Deborah E. Harkness

Average: 0.00, 0 Ratings

The Voynich Manuscript

By Deborah E. Harkness, Raymond Clemens

Average: 0.00, 0 Ratings

Time's Convert

By Deborah E. Harkness

Average: 0.00, 0 Ratings

From the #1 New York Times bestselling author of A Discovery of Witches and The Black Bird Oracle comes a novel about what it takes to become a vampire—the fourth in the All Souls series.Look for t...

John Dee's Conversations with Angels: Cabala, Alchemy, and the End of Nature

By Deborah E. Harkness

Average: 0.00, 0 Ratings

All Souls Trilogy Boxed Set

By Deborah E. Harkness

Average: 0.00, 0 Ratings

Shadow of Night

By Deborah E. Harkness

Average: 0.00, 0 Ratings

The World of All Souls

By Deborah E. Harkness, Deborah Harkness

Average: 0.00, 0 Ratings

From the author of The Black Bird Oracle comes a fully illustrated guide to the #1 New York Times bestselling All Souls series—“an irresistible . . . wonderfully imaginative grown-up fa...

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.