John Gregory Books

Lectures on the Duties and Qualifications of a Physician

By John Gregory

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Constrained Optimization In The Calculus Of Variations and Optimal Control Theory

By John A. Gregory

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This I Believe: On Love

By John Gregory, Dan Gediman, Mary Jo Gediman

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This I believe

By John Gregory, Dan Gediman, Mary Jo Gediman

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"Inspiring essays on love shared by men, women, and young people from all walks of life In the 1950's, Edward R. Murrow's radio program, This I Believe, gave voice to the feelings and treasured bel...

This I believe

By John Gregory, Dan Gediman, Mary Jo Gediman

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Carnival in Suburbia

By JOHN GREGORY

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A Comparative View Of The State And Faculties Of Man With Those Of The Animal World

By John Gregory

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Practical Endocrinology and Diabetes in Childhood

By John Gregory, Martin Savage, Joseph E. Raine, Malcolm Donaldson, J. Walker

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A manual of modern geography

By J. Gregory

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Understanding ballet

By Gregory John

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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.