Hannah Roche Books

Sandra's sun hat

By Hannah Roche

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When it's sunny, Sandra loves to wear her favorite sun hat.

Su's snowgirl

By Hannah Roche

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Su puts on her warmest clothes to play outside and with her friend Sandra builds a big snowgirl with noodle hair.

My Grandma s Great Science Made Simple Series

By Hannah Roche

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Millie helps Grandma make cookies. Includes their recipe and notes on what happens to its ingredients when they are combined, chilled, rolled, and baked.

My sister is super!

By Hannah Roche

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Michael helps Sophie make muffins. Includes their recipe and notes on how baking powder's acid and base chemically react together in the presence of moisture or heat.

Well of Loneliness

By Hannah Roche, Radclyffe Hall, Jana Funke

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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.