Christopher Sequeira Books

War of the Worlds

By Steve Proposch, Christopher Sequeira, Bryce Stevens

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Cthulhu Land of the Long White Cloud

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Justice League Adventures

By Josh Siegal, Christopher Sequeira, Dan Slott

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Gaslight Grimoire

By J. A. Campbell

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A collection of eleven all new tales of mystery and dark fantasy featuring Sherlock Holmes, master of deductive reasoning, confronting the irrational, the unexpected, and the fantastic in the weird...

Justice Inc.

By Mark Waid, Ronilson Freire, Christopher Sequeira, Alex Ross

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Sherlock Holmes

By Christopher Sequiera

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Caped Fear

By Steven Proposch, Christopher Sequeira, Bryce Stevens

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Dracula Unfanged

By Christopher Sequeira

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Dracula Unfanged

By Christopher Sequeira

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Dracula Unfanged

By Christopher Sequeira

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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.