Roy Doliner Books

The Sistine Secrets: Michelangelo's Forbidden Messages in the Heart of the Vatican

By Roy Doliner, Benjamin Blech

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The Sistine Secrets: Michelangelo's Forbidden Messages in the Heart of the Vatican

By Benjamin Blech

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Five hundred years ago Michelangelo began work on a painting that became one of the most famous pieces of art in the world-the Sistine Chapel ceiling. Every year millions of people come to see the...

Los secretos de la Capilla Sixtina: Los mensajes prohibidos de Miguel Angel en el corazon del Vaticano

By Roy Doliner, Benjamin Blech

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Identifies and analyzes secret messages encoded within the Sistine Chapel's ceiling fresco, revealing how the Renaissance artist imparted messages of brotherhood and revolution to free-thinkers and...

On the Edge

By Roy Doliner

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Sandra Rifkin s Jewel

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The thin line

By Roy Doliner

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The twelfth of April

By Roy Doliner

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On the edge

By Roy Doliner

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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.