Darryl Haefner Books

Firefighter Candidate Exams

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Provides information on preparing for the firefighter examination, including an analysis of the various types of questions, practice exercises, and tips on passing the physical abilities portion of...

Barron'S Firefighter Candidate Exams, 7th Edition

By James Murtagh, James J. Murtagh, Darryl Haefner, James J. Murtagh, Darryl J. Haefner

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This revised and updated manual presents-- A preliminary diagnostic exam with answers Five full-length practice exams typical of firefighter exams given to candidates across North America All te...

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.