Trade Loeffler Books

Zig and Wikki in Something Ate My Homework

By Nadja Spiegelman, Trade Loeffler

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Zig and Wikki in the Cow

By Spiegelman Nadja Loeffler Trade

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Zig and Wikki in Something Ate My Homework

By Nadja Spiegelman

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Zig and Wikki land on a planet full of strange creatures like flies, frogs, and raccoons, just when it seems to be lunchtime! Young readers learn about nature in our world thanks to the fascinating...

Zig and Wikki in The Cow

By Nadja Spiegelman And Illustrated By Trade Loeffler

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When alien pals Zig and Wikki lose their spaceship on Earth, their friendship is definitely in trouble. In order to get home, they must travel through a farm and into a cow, picking up fun facts ab...

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.