Acknowledgements
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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 unit.
Images
Introduction: © Grigvovan/Shutterstock.com; Section 2.1: © maridav/Bigstockphoto.com; Sections 5 and 6: © Flynt/Bigsstockphoto.com; Section 5.1: © Rawpixel.com/Bigstockphoto.com; Section 8: © Wavebreakmedia/Bigstockphoto.com.
Videos
Introduction: Amy Winter: © The Open University 2017.
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