John M. Wills Books

Women warriors

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A compelling collection of stories about women in law enforcement. Police officers, federal agents, chaplains, corrections officers and dispatchers, all share their stories, each on written in thei...

Women warriors

By John M. Wills

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The year without Christmas

By John M. Wills

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The family, friends and colleagues in officer Eric Doyle's life change drastically after a routine police call goes terribly, horribly awry.

Full Potential Electronic Structure Method

By John M. Wills, Anna Delin, Olle Eriksson, Per Andersson, Mebarek Alouani, Oleksiy Grechnyev

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Lessons from the Street

By John M. Wills

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Gripped By Fear A Chicago Warriors Thriller

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Gripped by Fear

By John M. Wills

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Targeted

By John Wills

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Chicago Warriors Midnight Battles in the Windy City

By John M. Wills

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Chicago Warriors Midnight Battles in the Windy City

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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.