Jan Pottker Books

Crisis in Candyland

By Janice Pottker

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Presents the story of the Mars family, their multinational company, and its successes and failures.

Sara and Eleanor: The Story of Sara Delano Roosevelt and Her Daughter-in-Law, Eleanor Roosevelt

By Janice Pottker, Jan Pottker

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An analysis of the relationship between Eleanor Roosevelt and her mother-in-law offers insight into Sara Delano Roosevelt's influence on Eleanor's achievements and Eleanor's role in the mispercepti...

Vivien Thomas

By Jan Pottker

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Vivien Thomas

By Jan Pottker

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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.