This course was written by Maria Townsend and Gill Gustar.
Some of the material in this course is based on material originally available on the.
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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:
Figure 2: © hddigital/Istockphoto.com; Figure 3: © xefstock/iStockphoto.com; Figure 4: © unknown; Figure 5: Shutterstock © pavelk.
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.
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