Karla Warkentin Books

Terror in Hawk s Village Time Stone Travelers Series

By Karla Warkentin

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Mystery in the medieval castle

By Karla Warkentin

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The time stone transports Josh and his siblings to a castle in twelfth-century England where they battle the thieves of a jeweled cross.

Treachery in the Ancient Laboratory Time Stone Travelers Series

By Karla Warkentin

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Escape from the volcano

By Karla Warkentin

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When the time stone transports Josh, Ellen, and Will to a Polynesian island sometime before Captain Cook's arrival, Josh learns a lesson about respect and obedience.

Rescue In The Mayan Jungle

By Karla Warkentin

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The time stone transports Josh and his siblings into a Mayan village where they try to save a priestess being held in virtual slavery.

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.