Tourmaline Books

Trap door

By Eric A. Stanley, Tourmaline, Johanna Burton

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The increasing representation of trans identity throughout art and popular culture in recent years has been nothing if not paradoxical. Trans visibility is touted as a sign of a liberal society, bu...

Trap Door

By Eric A. Stanley, Tourmaline, Johanna Burton

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Essays, conversations, and archival investigations explore the paradoxes, limitations, and social ramifications of trans representation within contemporary culture.The increasing representation of...

Saving Our Own Lives

By Adrienne Maree Brown, Tourmaline, Shira Hassan

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Saving Our Own Lives

By Adrienne Maree Brown, Tourmaline, Shira Hassan

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One Day in June

By Tourmaline

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You can sparkle, shimmer, shine – just like Marsha did.This vibrant and joyful picture book celebrates the legacy of Marsha P. Johnson, a Black trans woman and activist who played an instrume...

Marsha

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Black transgender luminary Tourmaline brings to life the first definitive biography of the revolutionary activist Marsha P. Johnson, one of the most important and remarkable figures in LGBTQIA+ his...

Marsha

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Marsha

By Tourmaline

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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.