David J. Bodycombe Books

Puzzle Carnival

By David J. Bodycombe

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Optical Illusions and Puzzles

By David J. Bodycombe

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Pocket Penguin Sudoku 3

By David J. Bodycombe

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The Penguin Sudoku Challenge

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Welcome to The Penguin Sudoku Challenge: with 1 sudoku puzzle for every day of the year 2 challenge you in every way on 3 different levels - beginner, moderate and fist-clenchingly tricky. Perfect...

Penguin Sudoku 2007

By David J. Bodycombe

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Riddles of the Sphinx

By David J. Bodycombe

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Penguin Sudoku 2013

By David J. Bodycombe

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Penguin Sudoku 2008: A Year's Supply of Sudoku and Some Fiendish New Japanese Puzzles

By David J. Bodycombe

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Penguin Sudoku 2006

By David J. Bodycombe

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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.