Stefan Petrucha Books

In this thrilling and surreal finale to the TimeTripper series, Harry Keller finds himself stuck back at Windfree mental hospital. All the progress he thought he’d made has crumbled and Harry...

Ripper

By Stefan Petrucha

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Panic grips the city! There is a killer loose in New York City, and Carver Young is the only one who sees the startling connection between the recent string of murders and the most famous serial ki...

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.