John Sazaklis Books

Spider-Man Classic: I Am Spider-Man

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When the Chameleon wreaks havoc throughout the city as Spider-Man, the real Spider-Man must stop the shapeshifting criminal.

Batman Classic: Fright Club

By John Sazaklis

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The Joker and Harley Quinn have joined forces with the Scarecrow and Mad Hatter to terrorize the citizens of Gotham City. Can Batman and Robin put the Fright Club out of business, or will they fall...

Batman Classic: Battle in Metropolis

By John Sazaklis

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Batman and Superman team up to battle the Joker and Lex Luthor in Metropolis.

Eternal enemies

By John Sazaklis

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Rā's al Ghūl has stolen the Scroll of Osiris and plans to use it to find and use a new Lazarus Pit, granting him immortality, and it is up to Batman, Nightwing, and Batwoman to stop him.

Justice league

By John Sazaklis

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Festivities turn frightful when Gentleman Ghost awakens the undead monster Solomno Grundy! With Solomon rampaging through the city, the members of the Justice League must use all the wit and techno...

Superman Classic Day of Doom I Can Read Level 2

By John Sazaklis

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Justice League Classic: I Am the Flash

By John Sazaklis

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Man of Steel: The Fate of Krypton

By John Sazaklis

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Superman saves Smallville

By John Sazaklis

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After Clark Kent discovers his true identity as a super-powered alien, he vows to protect Smallville from harm, and must battle against General Zod and his followers to save the planet.

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.