Richard L. Kagan Books

Lawsuits and litigants in Castile, 1500-1700

By Richard L. Kagan

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Inquisitorial Inquiries: Brief Lives of Secret Jews and Other Heretics

By Richard L. Kagan

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Inquisitorial inquiries

By Richard L. Kagan

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"On the first day of Francisco de San Antonio's trial before the Spanish Inquisition in Toledo in 1625, his interrogators asked him about his parentage. His real name, he stated, was Abram Rubén, a...

The Spanish Craze

By Richard L. Kagan

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El Greco de Toledo

By Richard L. Brown Jonathan Kagan

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Universidad y sociedad en la Espana moderna

By Richard L. Kagan

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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.