Charles Timmerman Books

Sudoku Book 800 Hard Puzzles

By Charles Timmerman

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Funster 101 Large-Print Challenging Crossword Puzzles

By Charles Timmerman

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Crossword puzzles that are fun and challenging! Stimulating brain exercise. 101 never-before-published puzzles for hours of entertainment. With a skill level similar to an average newspaper puzzle....

The Everything Christmas Word Search Book: 150 festive puzzles to celebrate the holiday season!

By Charles Timmerman

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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.