Cris Putnam Books

Exo Vaticana

By Cris Putnam, Thomas Horn

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The Supernatural Worldview

By Angie Peters, Cris Putnam

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The final Roman Emperor the Islamic Antichrist and the Vatican s last crusade

By Thomas R. Horn

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Predictions about a future war between Islam and "the Army of Rome", instigated by ISIS and employing weapons of mass destruction, all hidden in current documents examined and deciphered by the aut...

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.