Michael Robertson Books

The Baker Street letters

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In Los Angeles, a geological surveyor maps out a proposed subway route--and then goes missing. His eight-year-old daughter, in her desperation, turns to the one person she thinks might help--she wr...

Moriarty returns a letter

By Michael Robertson

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"Michael Robertson has delighted mystery readers and Sherlock Holmes aficionados everywhere with his charming and innovative Baker Street mystery series, where brothers Reggie and Nigel Heath are c...

The Baker Street jurors

By Michael Robertson

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The Baker Street letters

By Michael Robertson

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The brothers of Baker Street

By Michael Robertson

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The Baker Street translation

By Michael Robertson

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The brothers of Baker Street

By Michael Robertson

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Hoping to recoup his losses after answering a misdirected letter to Sherlock Holmes, barrister Reggie Heath represents a limousine driver who has been accused of murdering two tourists, a case that...

I Like My Car

By Michael Robertson

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A Level B I Like to Read book about cars, colors, and funny animals!The rhino loves his red car . . . which just happens to have a rhino-horn hood ornament. And the alligator loves her green car th...

Me gusta mi carro

By Michael Robertson

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Cars, colors, and funny animals abound in this simple book for young readers, now available in Spanish.The rhino loves his red car . . . which just happens to have a rhino-horn hood ornament. And t...

Moriarty returns a letter

By Michael Robertson

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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.