Mark Messina Books

The Vegetarian Way

By Mark Messina, Virginia Messina

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The Dietitian s Guide to Vegetarian Diets

By Mark Messina, Reed Mangels, Virginia Kisch Messina, Inc. Nutrition Matters, Vegetarian Resource Group

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"The Dietitian's Guide to Vegetarian Diets: Issues and Applications, Second Edition highlights the current trends and research on vegetarian diets and translates the information into practical idea...

The simple soybean and your health

By Mark Messina

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Dietitians Guide to Vegetarian Diets

By Mark Messina, Reed Mangels, Virginia Messina

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Dietitian s Guide to Vegetarian Diets

By Mark Messina, Reed Mangels, Virginia Messina

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The dietitian's guide to vegetarian diets

By Mark Messina

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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.