Katherine Gregor Books

“The political machinations, betrayal, and battles may appeal to those fans of George R. R. Martin's A Song of Ice and Fire series interested in a real-world game of thrones.” -- Booklist One of...

Cleopatra

By Alberto Angela, Katherine Gregor

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The Florios Of Sicily

By Stefania Auci, Katherine Gregor

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"In this grand part one of a two-volume saga, inspired by the real lives of history-making titans, The Florios of Sicily brings to life the dark secrets, the loves and betrayals, and the cruel acts...

Florios Of Sicily, The: A Novel

By Stefania Auci, Katherine Gregor

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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.