Heiwad Osman Books

AWS Certified Developer Official Study Guide

By Casey Gerena, Heiwad Osman, Jennifer Fisher, Nick Alteen, Marife Pagan

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AWS Certified Developer Official Study Guide

By Roger Davis, Deborah Lupo, Jennifer Fisher, Kai Dupe, Wes Gruven

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AWS Certified Developer Official Study Guide, Associate Exam: Associate (DVA-C01) Exam

By Casey Gerena, Heiwad Osman, Michael Roth, Jennifer Fisher, Wes Gruver, Nick Alteen, Asim Jalis, Marife Pagan, Santosh Patlolla

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The AWS exam has been updated. Your study guide should be, too. The AWS Certified Developer Official Study Guide-Associate Exam is your ultimate preparation resource for the latest exam! Covering...

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.