Penny Grubb Books

The murder of an East Yorkshire man puts private investigator Annie Raymond in the odd position of being hired by two clients working at cross-purposes. The accused, Joshua Yates, sits behind bars,...

Where there s smoke

By Penny Grubb

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Annie Raymond, PI, is now working in London on a case that has suddenly turned nasty, when she's asked to travel back to Yorkshire for another outing with the Thompson sisters. When someone gets to...

The Doll Makers PI Annie Raymond

By Penny Grubb

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Software Maintenance

By Armstrong A. Takang, Penny Grubb

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Writing a textbook

By Penny Grubb, Danuta Reah

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How To Be A Fantastic Writer

By Gabi Grubb, Penny Grubb, Danuta Reah

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The Doll Makers An Annie Raymond Mystery

By Penny Grubb

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Buried Deep

By Penny Grubb

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Like False Money

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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.