Robert Lopez Books

The Book of Mormon: The Testament of a Broadway Musical

By Robert Lopez, Matt Stone, Joan Marcus, Steven Suskin, Trey Parker

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The annotated script and lyrics for the hit Broadway musical and a behind-the-scenes guide featuring commentaries and anecdotes from the creators, cast, and crew.

Commercial Revolution in the Middle Ages

By Robert S. Lopez

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Advanced Engineering Mathematics Pie

By Robert Lopez

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Red Moon Rising

By Robert Proo Lopez

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Avenue Q The Musical Piano Vocal arrangement

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Avenue Q The Musical Vocal Selections

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The Platform Sutra of the Sixth Patriarch

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Zen Pivots

By Shigetsu Sasaki

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The Birth of Europe

By Robert S. Lopez

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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.