Trudy Harris Books

Over Under in and Ouch Silly Millies

By Trudy Harris, Steve Haskamp

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Over, under, in, and ouch!

By Trudy Harris

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Rhyming advice about some silly problems introduces the use of prepositions.

Glimpses of Heaven

By Trudy Nicholas Trudy Nicholas Tr Harris

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Glimpses of Heaven

By Trudy Harris, TrudyRN Harris

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20 hungry piggies

By Trudy Harris

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The wolf from "The Three Little Pigs" shows up at a party attended by lots of piggies, but his plans for dinner are disrupted by the pigs from "This Little Piggy Went to Market."

Gaining the fulness

By Jay Harris, Jay R. Harris

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The Seaweed Gatherers

By Trudy Harris, Jessica Blair

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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.