This free course was written by Liz Smith.
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The material acknowledged below and in the course 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:
Figure 1: © FreedomMaster/iStockphoto.com
Figure 2: photograph © georgeclerk/iStockphoto.com,trademark for toys owned by Lucasfilms Ltd: LLC
Figure 3: Brainmaster/iStockphoto.com
Figure 4: © BrianAJackson/iStockphoto.com
Figure 5: © ymgerman/iStockphoto.com
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