Sean Costello Books

Der Cartoonist.

By Sean Costello, Costello, Sean

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Eden'S Eyes

By Sean Costello, S. Costello

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Karen Lockhart has been blind all her life. Now she can see with a dead man's eyes but with her new blessing come an even greater curse: terror. Karen's world had grown dark until a vicious punk...

The Cartoonist

By Costello, Sean, Sean Costello

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Edens Eyes

By Sean Costello

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Captain Quad

By Sean Costello, Costello

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Eden'S Eyes

By Sean Costello

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Captain Quad

By Sean Costello

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Eden'S Eyes

By Sean Costello

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Cartoonist

By Sean Costello

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Finders Keepers

By Sean M. Costello, Sean Costello, Costello, Sean M.

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Ever dreamed of winning the lottery? One of those massive, life-altering purses? Join Keith Whipple and his daughter Kate as they do just that, netting ten million dollars in a single-winner draw....

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.