Theodore M. Porter Books

The Cambridge History of Science Volume 7

By Dorothy Ross, Theodore Porter

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Trust in Numbers

By Theodore M. Porter

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Trust in Numbers

By Porter Theodore M, Theodore M. Porter

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The rise of statistical thinking, 1820-1900

By Theodore M. Porter

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Genetics in the madhouse

By Theodore M. Porter

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In the early 1800s, a century before there was any concept of the gene, physicians in insane asylums began to record causes of madness in their admission books. Almost from the beginning, they poin...

Karl Pearson

By Theodore M. Porter

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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.