Andrew Marttila Books

Cats on catnip

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A humorous collection of dozens of photos of funny and adorable cats as they play with, roll in, and chow down their favorite snack of choice -- catnip.

Cats on Catnip Wall Calendar 2020

By Workman Calendars, Andrew Marttila

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Shop Cats of New York

By Andrew Marttila, Tamar Arslanian

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Cats of the World

By Hannah Shaw, Andrew Marttila

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*An Instant New York Times Bestseller*Hannah “Kitten Lady” Shaw and professional cat photographer Andrew Marttila journey to thirty countries to bring you hundreds of photos and stories...

Cats on Catnip

By Andrew Marttila

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Cats on Catnip

By Andrew Marttila

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Cats on Catnip

By Andrew Marttila

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How to Take Awesome Photos of Your Cat

By Andrew Marttila

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How to Take Awesome Photos of Cats

By Andrew Marttila

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Cats on Catnip 2 In 1 Double Sided 1 000 Piece Puzzle

By Andrew Marttila

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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.