Gary Gianni Books

A Knight of the Seven Kingdoms

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NEW YORK TIMES BESTSELLER • Taking place nearly a century before the events of A Game of Thrones, A Knight of the Seven Kingdoms compiles the first three official prequel n...

Hellboy

By Mike Mignola

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"Hellboy sets sail from the wreckage of a deserted island only to cross paths with a ghost ship. Taken captive by the phantom crew that plans to sell him to the circus, Hellboy is dragged along by...

The Dark Horse Book of Horror

By Evan Dorkin, Jill Thompson, Sean Phillips, Mike Mignola, Gary Gianni

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Gary Gianni's Monstermen and Other Scary Stories

By Written, Illustrated By Gary Gianni

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Hot off the success of Hellboy: Into the Silent Sea, Gianni's original masterpiece returns in paperback!  Includes an introduction by Pulitzer Prize-winning novelist Michael Cha...

Shadow

By Michael Wm. Kaluta, Joel Goss, Gary Gianni

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Edgar Rice Burroughs Tarzan

By Michael Wm. Kaluta, Thomas Yeates, Charles Vess, Edgar Rice Burroughs, Joe R. Lansdale, Gary Gianni

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The Dark Horse book of witchcraft

By Scott Morse, Tony Millionaire, Jill Thompson, Mike Mignola, Gary Gianni

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Eight short stories about witches and witchcraft illustrated in graphic format, plus an interview with Wiccan High Priestess Phyllis Curott.

Darkness Mist Shadows Volume 1 pb

By Basil Copper, Les Edwards, Allen Kosowski, Stephen Jones, Gary Gianni, Stephen E. Fabian

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El caballero de los Siete Reinos

By Cristina Macia Orio, Irene Vidal Oliveras, Raquel Marques Garcia, Gary Gianni, George R. R. Martin, Enrique Jimenez Corominas

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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.