David M. O′Brien Books

"Discusses the make-up and function of the U.S. system of government. Its primary focus is on the modern political system in the United States, centering on how the federal and state governments ar...

Government by the people.

By Paul Charles Light, David B. Magleby, Thomas E. Cronin, David M. O Brien, J. W. Peltason, Milton Clarke

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"Discusses the make-up and function of the U.S. system of government. Its primary focus is on the modern political system in the United States. Seven chapters are devoted to the political system of...

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.