William C. Harvey Books

Spanish for Law Enforcement Dictionary of Computer Internet Terms
Spanish Every Day
Spanish every day
Spanish every day

By William C. Harvey

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Ingles para latinos.
Ingles para latinos.

By William C. Harvey

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Ingles Todos Los Dias
Ingles Todos Los Dias

By William C. Harvey

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Teaches Spanish-speaking students basic English, using cartoon-style illustrations and explanations in Spanish.

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Complete Spanish Grammar Review
Spanish for the Construction Trade
Spanish for Law Enforcement Personnel
Spanish for Gringos Level 1
Spanish for Gringos Level 2

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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.

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