ISBN 978-952-7327-31-9

Year of publication: 2020
Updated: 12.8.2020

© Authors and e-Oppi Oy, 2020

License: The right of use for this book is subject to a charge. Schools pay a yearly licensing fee in accordance to the number of students that use this book. The book may not be openly distributed online nor copied for the use of others. Full licensing information is found here.

Cover photo: Shutterstock.com
Photographs and images: Oskari Härmä, Juha-Pekka Salminen, Simo Veistola and e-Oppi, unless otherwise specified.