Robert A. Herrera Books

Donoso Cortes

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Don Juan Donoso Cortes (1809-1853) is one of those rare figures whom academicians find difficult to slot into any conventional category. An eminent Spanish figure - statesman, journalist, politicia...

Silent Music

By Robert A. Herrera

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"St. John of the Cross has long inspired Christians seeking a deeper knowledge of God. This sixteenth-century Spanish mystic left a record of personal faith as profound as any ever recorded. In Sil...

Mystics in spite of themselves

By Robert A. Herrera

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Reasons for our rhymes

By Robert A. Herrera

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"Reasons for Our Rhymes provides a chronological overview of the major philosophical approaches to human history. R. A. Herrera clearly presents the ideas and influence of key figures from the past...

Saints Sovereigns and Scholars

By James Lehrberger, R. A. Herrera

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Mystics of the Book

By Robert A. Herrera

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Anselm s Proslogion

By R. A. Herrera

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Lamps of Fire.

By Robert Herrera, Robert A. Herrera

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Orestes Brownson

By Robert A. Herrera

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"Orestes Brownson is a new study of a major nineteenth-century intellectual whose work spanned a critical period of American and European history. R. A. Herrera delineates the "advancements" (to us...

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.