Roland Perry Books

Last of the Cold War Spies: The Life of Michael Straight--The Only American in Britain's Cambridge Spy Ring

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The most damaging spy network of the Cold War - the infamous Cambridge Spy Ring - was comprised of several powerful and influential British citizens, and one American, Michael Straight. Incorporati...

Last of the Cold War Spies: The Life of Michael Straight - the Only American in Britain's Cambridge Spy Ring

By Roland Perry

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The Fifth Man

By Roland Perry

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The Exile

By Roland Perry

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Programme for a puppet

By Roland Perry

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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.