Usage Books

Kites Sail High
Kites Sail High

By Ruth Heller

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Perfect for introductory grammar lessons! What is a verb? Explore language and discover how to identify verbs and their many forms from the imperative mood to active vs. passive voice to verb...

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Behind the Mask
Behind the Mask

By Ruth Heller

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The A Z of Non Sexist Language
Newspaper Spanish
International English usage
International English usage

By Loreto Todd

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A dictionary of cliches
A dictionary of cliches

By Eric Partridge

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The penguin dictionary of troublesome words
Words Fail Me
Words Fail Me

By Teresa Monachino

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A Guide To English In The 21st Century
Improve your written English

Related Articles from our Blog

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.

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