Gemma Halliday Books

When sixteen-year-old Hartley Featherstone finds out that her boyfriend is cheating on her, she goes to his house to confront him and suddenly finds herself embroiled in a murder mystery.

Social Suicide

By Gemma Halliday

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"Hartley Featherstone's first big story for the school paper takes an unexpected turn when she discovers the girl she's supposed to interview dead in her swimming pool"--

Deadly Cool

By Gemma Halliday

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Social Suicide

By Gemma Halliday

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Play nice

By Gemma Halliday

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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.