David E. Gumpert Books

Inc. magazine presents how to really create a successful business plan

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This comprehensive step-by-step guide takes you through the critical business planning issues of company strategy: What's your Identity? Marketing issues: Who are the buyers? Product/Service issues...

How to Really Start Your Own Business

By David E. Gumpert

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Inc. magazine presents how to really create a successful marketing plan

By David E. Gumpert

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Guide to Creating a Successful Business Plan

By David E. Gumpert

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How to Really Start Your Own Business

By David E. Gumpert

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Gouster Girl

By David Gumpert

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Raw Milk Revolution

By Joel Salatin, David E. Gumbert

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Life Liberty and the Pursuit of Food Rights

By David E. Gumpert

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How to Really Create a Successful Marketing Plan

By David Gumpert

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The Raw Milk Answer Book

By David E. Gumpert

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The Raw Milk Answer Book raises the most difficult questions surrounding our most controversial food--about the risk of getting seriously ill, whether it should be fed to children, the credibility...

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.