Robert Polner Books

America's Mayor, America's President?

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Rudy Giuliani’s admirably flinty response to the horrifying events of 9/11 made him a national hero, positioning him for big things to come  a run at the highest office &#160...

The man who saved New York

By Seymour Lachman

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Irish Passion for Justice

By Robert Polner, Michael Tubridy

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Three Men in a Room

By Seymour P. Lachman, Seymour Lachman, Robert Polner

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Three Men in a Room

By Seymour P. Lachman, Robert Polner

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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.