Christopher Penczak Books

Sacred Tears

By Christopher Penczak, Courtney Weber

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Sacred Tears

By Christopher Penczak, Courtney Weber

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City magick

By Christopher Penczak

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"Today's urban witch needs to know how to communicate with the electric gods of the city, find the high-rise temples of power, and uncover the magical symbols in everyday graffiti. This new edition...

Green Egg Omelette

By Christopher Penczak, Oberon Zell Ravenheart, Clifton S. Clifton

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City Magick

By Christopher Penczak

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Gay Witchcraft

By Christopher Penczak

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Spirit Allies

By Christopher Penczak

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Flower Essences from the Witch s Garden

By Christopher Penczak, Nicholas Pearson

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Flower Essences from the Witch s Garden

By Christopher Penczak, Nicholas Pearson

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Foundations of the Temple

By Christopher Penczak

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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.