Trevor Johnson Books

An analysis of a wide range of Hardy's poems, including love poems, poems about people, places and ideas and some about seasons and animals. The poems are grouped by subject, the text used is from...

A critical introduction to the poems of Thomas Hardy

By Trevor Johnson

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An analysis of a wide range of Hardy's poems, including love poems, poems about people, places and ideas and some about seasons and animals. The poems are grouped by subject, the text used is from...

Teach Yourself Mathematics

By Trevor Johnson, Pat Levy, Hugh Neil

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A Private Company s Purchase of Own Shares

By Trevor Johnson

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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.