Roberts Mark Books

London is in the grip of a barbaric serial killer, dubbed Herod by the tabloid press. Four women have been abducted in quick succession, their bodies mutilated in quick succession, their bodies mut...

What she saw

By Roberts Mark

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When a nine-year-old boy is left to die inside a burning car on a sink estate in Peckham, DCI David Rosen is drafted in to investigate. The young boy has been severely burned, and is now fighting f...

What she saw

By Roberts Mark

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What She Saw

By Roberts Mark

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Boy Question

By Roberts Mark

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Boy Question

By Roberts Mark

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Boy Question

By Roberts Mark

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Behaviour Whisperer

By Roberts Mark

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23 Hour Rule

By Roberts Mark

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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.