Sully, Philippa
Mosby Elsevier, 2010
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Boyd, Claire
Wiley Blackwell, 2014
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McEwen, Abayomi
McGraw-hill Open Univer, 2011
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Cooley, Marcia
Reston publishing, 1988
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Callaghan, Patrick; Playle, John; Cooper, Linda, editor
Oxford Univesity Press, 2009
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