Don L. Wulffson Books

Nightmares Cave of Fear

By Don Walffson, Don L. Wulffson

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While on a camping trip, the reader gets lost in a cave and makes choices which determine the story's outcome.

Nightmares Castle Horror

By Don Walffson, Don L. Wulffson

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The reader's decisions control the outcome of a stay in a nightmarish castle in Scotland.

Nightmares Valley of the Screaming Statues

By Don Walffson, Don L. Wulffson

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The reader chooses the outcome of a teenage boy's nightmare in which he searches a Malaysian jungle for his missing brother and anthropologist father.

The Basics of Writing Book 3

By Dan L. Wulffson

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Six-minute mysteries

By Don L. Wulffson

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A collection of fourteen short mystery stories.

More six-minute mysteries

By Don L. Wulffson

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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.