Charles Wm Sullivan Books

Welsh Celtic myth in modern fantasy

By C. W. Sullivan, Charles Wm Sullivan

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As tomorrow becomes today,

By Charles Wm Sullivan

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An anthology of science fiction stories designed to be utilized in the instruction of English composition and literature at the high school level.

Heinlein s juvenile novels

By Charles Wm Sullivan

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"Robert A. Heinlein was one of the most revered science fiction writers in America during the twentieth century. He published his early, juvenile science fiction novels between 1947 and 1958. This...

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.