Roberta L. Duyff Books

Nutrition Health Safety Preschool by Roberta L. Duyff 1995 Hardcover

By Roberta L. Duyff

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365 Days of Healthy Eating from the American Dietetic Association

By Roberta Larson Duyff, American Dietetic Association

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Whole Language Guide

By Roberta Duyff

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Smiles for smiles

By Roberta Larson Duyff

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Smiles and his friends go on an exciting visit to the peanut butter pantry where they learn some important lessons about good nutrition.

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.