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by Helen Aveyard; Pam Sharp
by Helen Aveyard; Pam Sharp; Mary Woolliams
by Sharp, Helen M.
by Helen Sharp (Open University, UK); Yvonne Rogers (Open University); Jenny Preece (University of Maryland, USA)
by Sharp, Helen M.; Kopetskie, Thomas
by Aveyard, Helen; Sharp, Pam
by Aveyard, Helen; Sharp, Pam; Woolliams, Mary
by Yvonne Rogers (Open University); Helen Sharp (Open University); Jenny Preece (University of Maryland)