Joost Effers Books

Water Babies: Counting

By Yvonne Hooker, ANNA NILSEN, Zena Holloway, Marilyn Singer, Diane McGowan, Joost Effers, Rick Walton, Saxton Freymann, Lois Ehlert, Hinckley Public Library District (Hinckley, Ill), Mark Schrooten

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Its a quiet night in the woods, and a group of campers is asleep. That is, until one frog, two owls, three geese, four fish, and a host of rambunctious animals get together to create a symphony of...

One Lonely Seahorse

By Joost Elffers, Saxton Freymann

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One lonely sea horse learns that she has a lot of friends--friends she can really "count" on.

One Green Frog

By Yvonne Hooker

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How Are You Peeling Foods with Moods

By Joost Effers, Sexton Freymann

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I can count 1 to 10

By Anna Nilsen

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A flip-card counting book in which readers choose a card, count the objects pictured on it, and flip the card to find the correct number displayed.

Quiet night

By Marilyn Singer

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One frog, two owls, three geese are joined by increasingly larger numbers of different animals that keep ten campers from falling asleep in their tent.

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.