Thomas R. Quackenbush Books

Relearning to see

By Thomas R. Quackenbush

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Relearning to See

By Thomas R. Quackenbush

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In this accessible presentation of the famous Bates method, Thomas R. Quackenbush (who teaches the Bates method in California and Oregon) describes how eyesight can improve naturally, at any age...

Better Eyesight

By William H. Bates Edited By Thomas R. Quackenbush

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Artists, teachers, army officers, housewives, elderly people, parents, and children with vision problems write about their experiences with the Bates Method and giving up their glasses in Better Ey...

Restoring Your Eyesight

By Thomas R. Quackenbush, Doug Marsh

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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.