Stefan Petrucha Books

During Nostalgia Week in River Heights, the dolls in Emma Blavatsky's antique dollhouse start depicting strange crimes that soon become true. When Nancy investigates, she witnesses her own murder b...

Nancy Drew, girl detective.

By Stefan Petrucha

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When an ancient artifact and a little boy go missing, Nancy and her friends are on the case. The artifact may prove that the Chinese discovered America prior to Columbus, but someone doesn't want t...

The Fake Heir (Nancy Drew: Girl Detective Graphic Novels 5)

By Stefan Petrucha

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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.