Jessica Polka Books

75 seashells fish coral colorful marine life to knit crochet

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Features seventy-five knitting and crocheting patterns based on seaside objects, including seahorses, jellyfish, and crabs, and includes technical sections covering material requirements and step-b...

200 Fun Things to Knit

By Kristin Nicholas, Lesley Stanfield, Jessica Polka

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200 Fun Things to Crochet

By Kristin Nicholas, Lesley Stanfield, Betty Barnden, Jessica Polka

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75 Shells Corals Colourful Creatures of the Sea to Knit Crochet

By Jessica Polka

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Preprints

By Oya Y. Rieger, Iratxe Puebla, Jessica Polka

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200 Fun Things to Knit

By Lesley Stanfield, Jessica Polka

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200 Fun Things to Crochet

By Lesley Stanfield, Betty Barnden

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75 caracolas peces y otros seres marinos para calceta y ganchillo

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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.