John Cramer Books

Pioneers, politics and people

By Cramer John Sir

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Auschwitz in der deutschen Geschichte

By John Cramer, Rudiger Fleiter, Claus Fullberg Stolberg, Heinz Bruggemann, Helmut Kramer, Jael Geis

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"Gripping novel of hard science fiction by physicist author recounts discovery of the Twistor Effect, which opens doors into countless alternate universes and draws dangerous attention from industr...

A Brief History of Physical Science

By John Cramer

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The Siege of Haven

By John Cramer

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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.