Bob Rozakis Books

Batgirl

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Collects the best adventures of Batgirl, from her debut in 1967 to her integration as a prominent member of the DC Universe.

The secret society of super villains

By Gerry Conway

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The Secret Society of Super Villains

By David Anthony Kraft, Terry Austin, Al Milgrom, Josef Rubinstein, Paul Levitz, Jack Abel, Vince Colletta, Bob Rozakis, Rich Buckler, Gerry Conway, Kick Giordano, Ernie Chan, Pablo Marcos

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The secret history of AA comics

By Bob Rozakis

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"In the 1940s, M.C. Gaines sold his All-American Comics line to his partners at DC Comics. But what if, instead, he had bought out DC? And suppose Green Lantern and The Flash had become the survivi...

Lex Luthor Color Actv

By Bob Rozakis

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Junkyards of Memory

By Bob Rozakis

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Complete Idiot s Guide to Office Politics

By Bob Rozakis, Laurie Rozakis

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Answer Man s Book of Trivia Quizzes

By Bob Rozakis

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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.