Liliane J. Opsomer Books

The unofficial guide Walt Disney world with kids 2016

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Compiled and written by a team of experienced researchers whose work has been cited by such diverse sources as USA Today and Operations Research Forum, The Unofficial Guide to Walt Disney World wit...

Unofficial Guide R to Walt Disney World R with Kids 2011

By Bob Sehlinger, Len Testa, Liliane Opsomer, Menasha Ridge

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Unofficial Guide to Walt Disney World with Kids 2013

By Bob Sehlinger, Len Testa, Liliane J. Opsomer

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The Unofficial Guide To Walt Disney World With Kids 2013

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Unofficial Guide to Walt Disney World with Kids 2013

By Bob Sehlinger, Len Testa, Liliane J. Opsomer

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Unofficial Guide to Walt Disney World with Kids 2013

By Bob Sehlinger, Len Testa, Liliane J. Opsomer

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The Unofficial Guide To Walt Disney World With Kids 2014

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The unofficial guide to Walt Disney World with kids

By Bob Sehlinger

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Hotels, attractions, and restaurants in all price categories are listed with evaluations based on reader surveys and critiques--compiled by unbiased inspectors of Orlando's most famed attraction.

Unofficial Guide to Walt Disney World with Kids 2017

By Bob Sehlinger, Len Testa, Liliane J. Opsomer

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Unofficial Guide to Walt Disney World with Kids 2023

By Bob Sehlinger, Len Testa, Liliane J. Opsomer

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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.