Harry Mazer Books

Heartbeat

By Norma Fox Mazer

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The solid gold kid

By Norma Fox Mazer

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Derek Chapman hitches a ride and later realizes he has unwittingly assisted in what he has dreaded and anticipated--his own kidnapping.

Bright days stupid nights

By Norma Fox Mazer

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During the summer internship on a newspaper, fourteen-year-old Vicki develops a love-hate relationship with Chris, the only male intern, and writes a sensational story about her friend Faith which...

Night terrors

By Lois Duncan

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A collection of eleven original stories that deal with ghosts and gangs, murders and monsters.

Bright Days, Stupid Nights

By Norma Fox Mazer

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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.