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Barnum C., . (2020). Usability Testing Essentials, 2ed. Morgan Kaufmann: Elsevier.
Barnum Carol, . 2020. Usability Testing Essentials, 2ed. Morgan Kaufmann: Elsevier.
Barnum Carol, . Usability Testing Essentials, 2ed. Morgan Kaufmann: Elsevier. 2020.