Acknowledgements
This free course was written by Stephen Burnley.
Except for third party materials and otherwise stated (see terms and conditions [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)] ), this content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence.
The material acknowledged below is Proprietary and used under licence (not subject to Creative Commons Licence). Grateful acknowledgement is made to the following sources for permission to reproduce material in this free course:
Course image: © Filip Kristic / www.istockphoto.com
Figure 1 © The Open University
Figure 2 © The Open University
Figure 3 © The Open University
Figure 4 © The Open University
Figure 5 © Handout/Getty Images
Figure 6 © The Open University
Figure 7 © Stuart Axe / www.Flickr.com
Figure 8 © The Open University
Figure 9 © The Open University
Figure 10a © Mercury Press / Getty
Figure 10b © Trinity Mirror/Mirrorpix/Alamy
Figure 10c © Wikipedia.org. Rightsholder unknown
Figure 10d © shaunl / www.istockphoto.com
Figure 11 © The Open University
Figure 12 © The Open University
Figure 13 © The Open University
Figure 14 © The Open University
Figure 15 © The Open University
Figure 16 © The Open University
Figure 17 © The Open University
Every effort has been made to contact copyright owners. If any have been inadvertently overlooked, the publishers will be pleased to make the necessary arrangements at the first opportunity.
Don't miss out
If reading this text has inspired you to learn more, you may be interested in joining the millions of people who discover our free learning resources and qualifications by visiting The Open University – www.open.edu/ openlearn/ free-courses.