Gregory Davidson Books

Some Common Pascal Programs

By Brian Williamson, Gregory Davidson, V. C Marney-Petix, Brad Hellman, V. C. Marney-Petix, Gregory Davidson, Brad Hellman, Brian Williamson

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Future value of an investment; Future value of regular deposits; Regular deposits; Initial investment; Minimun investment for withdrawals; Nominal interest rate on investment: earned interest table...

Practical Pascal Programs: Based On The Book Practical Basic Programs : Basic Programs Converted To Pascal

By Gregory Davidson, Lon Poole

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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.