David Alvarez Books

Secret messages

By David J. Alvarez

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Spies in the Vatican

By David Alvarez

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"Reviewing the pontificates of ten popes - from Pius VII, Napoleon's nemesis, to Pius XII, maligned by some as "Hitler's pope"--Alvarez provides the first history of the intelligence operations and...

Spying through a glass darkly

By David J. Alvarez

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"This book chronicles the struggles of American intelligence agencies to come to grips with Europe's new postwar realities, including the growing dominance of the Soviet Union, its recent ally in t...

Nothing sacred

By David J. Alvarez

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Nothing Sacred is the first book to document the Nazi espionage campaign against the Vatican in the Second World War. Nazi Germany considered the Catholic Church to be a serious threat to its domes...

Nothing sacred

By David J. Alvarez

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Allied and axis signals intelligence in World War II

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Religion and society in the American West

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El Mejor Es Mi Papa My Dad Is the Best Gongoli

By David Alvarez, Georgina Lazaro Leon

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Espionnage au Vatican

By David Alvarez

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Les espions du Vatican espionnage et intrigues de Napoleon a la Shoah

By David Alvarez

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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.