Measuring the user experience : collecting, analyzing, and presenting usability metrics.

MLA

Tullis, Tom, and Bill Albert. Measuring the User Experience : Collecting, Analyzing, and Presenting Usability Metrics. Amsterdam: Elsevier, 2008.

APA

Tullis, T., & Albert, B. (2008). Measuring the user experience : collecting, analyzing, and presenting usability metrics. Amsterdam: Elsevier.

Chicago

Tullis, Tom, and Bill Albert. Measuring the User Experience: Collecting, Analyzing, and Presenting Usability Metrics. Amsterdam: Elsevier, 2008.