Gilbert Valverde Books

Many Visions, Many Aims: A Cross-National Investigation Of Curricular Intentions In School Mathematics

By Curtis C. McKnight, William H. Schmidt, David E. Wiley, Richard T. Houang, Gilbert Valverde

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Which goals and standards guide mathematics education across the world? This first report of the Third International Mathematics and Science Study (TIMSS) explores this question by examining the ri...

According to the Book

By W.H. Schmidt, Richard G. Wolfe, Richard T. Houang, Leonard J. Bianchi, Gilbert A. Valverde

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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.