128 Booth Paul Op Cit pp 108 109 129 Desurvire Heather W Op Cit pp 173 202 130

128 booth paul op cit pp 108 109 129 desurvire

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128 Booth, Paul; Op. Cit .; pp. 108-109. 129 Desurvire, Heather W.; Op. Cit. ; pp. 173-202. 130 Nielsen, Jakob; Usability Engineering . New York: Academic Press, 1993; p. 34. 131 Nielsen, Jakob; Ibid. ; p. 35.
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