John Weller Books

Themes in the Christian History of Central Africa

By John Weller, Terance O. Ranger

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Themes in the Christian History of Central Africa

By John Weller, Terance O. Ranger

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Themes in the Christian History of Central Africa

By John Weller T.O. Ranger

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Violin down

By Weller John Violinist

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At the height of his passion, a young man's love for the violin is cut short. Virtually assured of a future as a violinist, he suddenly finds his dreams shattered, his technique obliterated and a l...

Modern agriculture and rural planning.

By John Weller

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Agricultural buildings planning and allied controls

By John B. Weller

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The Flying Bishop

By John Weller

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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.