Eric W. Johnson Books

VD, enfermedades venereas

By Eric W. Johnson

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Vdi En Fermedades Venereas

By Eric W. Johnson

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Older Wiser

By Eric W. Johnson

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People Love Sex Families

By Eric W. Johnson

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Love and sex and growing up

By Eric W. Johnson

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Describes the process of human reproduction from fertilization to birth, explains growth and sexual maturation, and discusses sexually transmitted diseases. Includes a glossary and review questions.

Our World into Words

By Eric W. Johnson

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Love and Sex in Plain Language

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How to achieve competence in English

By Eric W. Johnson

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Love and sex and growing up

By Eric W. Johnson

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Describes the process of human reproduction from fertilization to birth, explains growth and sexual maturation, and discusses sexually transmitted diseases. Includes a glossary and review questions.

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.