Lewis L. Gould Books

Presidency of William McKinley

By Lewis L. Gould

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The Spanish-American War and President McKinley

By Lewis L. Gould

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"Based on an earlier study, The presidency of William McKinley"--Pref.

Lady Bird Johnson and the environment

By Lewis L. Gould

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The presidency of Theodore Roosevelt

By Lewis L. Gould

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Lady Bird Johnson

By Lewis L. Gould

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"Lewis Gould shows why Mrs. Johnson ranks with Eleanor Roosevelt as a significant innovator of the First Lady role.". "Building upon his much admired Lady Bird Johnson and the Environment, Gould h...

The Modern American Presidency

By Lewis L. Gould

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Four hats in the ring

By Lewis L. Gould

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Four Hats in the Ring

By Lewis L. Gould

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Edith Kermit Roosevelt

By Lewis L. Gould

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Chief Executive to Chief Justice

By Lewis L. Gould

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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.