Cita APA (7a ed.)

Willis, G. B. (2005). Cognitive interviewing: A tool for improving questionnaire design. Sage.

Cita Chicago Style (17a ed.)

Willis, Gordon B. Cognitive Interviewing: A Tool for Improving Questionnaire Design. Thousand Oaks, California [etc.]: Sage, 2005.

Cita MLA (9a ed.)

Willis, Gordon B. Cognitive Interviewing: A Tool for Improving Questionnaire Design. Sage, 2005.