Heddy Johannesen Books

One Night in Salem

By Laurie Moran, Jonathan D. Nichols, Samantha Lucero, Patrick Cooper, Bret Valdez, Linette Kasper, Heddy Johannesen, Nancy Brewka Clark, E.F. Sweetman, Benjamin Thomas, Kathleen Halecki, Kevin Lewis, Charles Reis, Ellery D. Margay, R.C. Mulhare, Steve Zisson, Erin Crocker, Amber Newberry, Jim Towns, Dan LeFever

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Wax Wane A Gathering of Witch Tales

By Dara Marquardt, Liam Hogan, Jo Wu, Heddy Johannesen, Jeff Parsons, Stephanie Burgis, Dave Dormer, Stephen Blake, Spinster Eskie, Jennifer Loring, Virginia M. Mohlere, Coy Hall, Joseph Rubas, Megan Neumann, Cynthia Ward, J.T. Lawrence, Kevin M. Folliard, Lawrence Dagstine, D.T. Neal

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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.