Toepoel, V. (2016). Doing surveys online. SAGE.
Cita Chicago (17th ed.)Toepoel, Vera. Doing Surveys Online. Los Angeles: SAGE, 2016.
Cita MLA (9th ed.)Toepoel, Vera. Doing Surveys Online. SAGE, 2016.
Atenció: Aquestes cites poden no estar 100% correctes.