Lawrence D. Mass Books

Confessions of a Jewish Wagnerite: Being Gay and Jewish in America

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In 1981, Lawrence Mass was a 35-year-old physician, writer and gay activist living in New York City. On his living-room wall, among other opera memorabilia, there were five pictures of Richard Wagn...

Confessions of a Jewish Wagnerite: Being Gay and Jewish in America

By Lawrence D. Mass

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We Must Love One Another or Die

By Lawrence D. Mass

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On the Future of Wagnerism

By Lawrence D. Mass

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Song of Myself

By Lawrence D. Mass, Arnie Kantrowitz, Patrick Merla

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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.