Helen Hull Jacobs Books

The tennis machine.

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A thirteen-year-old girl's personal needs conflict with the rigid guidelines her father feels she must follow to become a tennis champion.

Tennis

By Edward Way

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Shows the hard work and dedicated training required to succeed as top tennis players. Four tennis players share their dream of turning their talents into professional careers and their experiences...

Gallery of Champions

By Helen Hull Jacobs, Helen H. Jacobs

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Famous modern American women athletes

By Helen Hull Jacobs

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Brief biographies of eight American women who have excelled in bowling, skating, diving, golf, skiing, swimming, tennis, or track.

Modern Tennis

By Helen Hull Jacobs

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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.