Noah D. Oppenheim Books

Now updated to reflect current events, this daily digest of intellectual challenge and learning will arouse curiosity, refresh knowledge, expand horizons, and keep the mind sharp.Millions of Americ...

365 Dias para Ser Mas Culto

By Noah D. Oppenheim

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365 dias para Ser Mas Culto 365 Days to Be More Knowledgeable

By David S. Kidder, Noah D. Oppenheim

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The Intellectual Devotional: American History

By David S. Kidder, Noah D. Oppenheim

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Modeled after those bedside books of prayer and contemplation that millions turn to for daily spiritual guidance and growth, the national bestseller The Intellectual Devotional—offering secul...

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.