Robert E. Lerner Books

This is the first complete biography of Ernst Kantorowicz (1895--1963), an influential and controversial German-American intellectual whose colorful and dramatic life intersected with many of the g...

The feast of Saint Abraham

By Robert E. Lerner

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"Robert E. Lerner uncovers a strain of medieval millennial thought that conceived of a peaceful place for Jews at the end of time. Its proponents maintained that "the candelabra of the Church woul...

Neue Richtungen in der hoch- und spatmittelalterlichen Bibelexegese

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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.