John Kovalic Books

Necronomicon - Geheimnisse Des Mythos

By Steve Jackson, Ingo Ahrens, John Kovalic

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Super Munchkin

By Steve Jackson Games, Steve Jackson, MUNCHKIN, John Kovalic

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Munchkin 4: The Need For Steed

By MUNCHKIN, Steve Jackson, John Kovalic

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Munchkin 4: The Need for Steed is the third expansion for the original Munchkin—112 more John Kovalic-illustrated cards for killing monsters, stealing treasure, and backstabbing your fellow players...

Super Munchkin: The Narrow S Cape

By Steve Jackson, MUNCHKIN, John Kovalic

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There comes a time in every munchkin's career when he's taken on more than he can handle, bitten off more than he can chew, gotten in over his head. So run away! And laugh! It's time for—the Narrow...

Munchkin 5 De-Ranged

By Steve Jackson, John Kovalic

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Munchkin Cthulhu 2 Call Of Cowthulhu

By Steve Jackson Games, Steve Jackson, John Kovalic

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Munchkin Cthulhu Cursed Demo

By Steve Jackson Games, John Kovalic

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Wild Life Files

By Steven D. Fortney, John Kovalic, Steven Fortney

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The Wild Life Journals

By John Kovalic

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Gamemastering Secrets Second Edition

By John R. Phythyon Jr., Aaron Rosenberg, Ross Winn, Larry D. Hols, Ann Dupuis, Frank Mentzer, Hilary Doda, Mark Simmons, Sam Chupp, Lester Smith, Kenneth Hite, Jean Rabe, Matt Forbeck, Steven S. Long, Lee Gold, John Kovalic, John Nephew, Steven Marsh, James M. Ward

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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.