Punch, K. F. (2003). Survey research: The basics. Sage.
Cita Chicago (17th ed.)Punch, Keith F. Survey Research: The Basics. London: Sage, 2003.
Cita MLA (9th ed.)Punch, Keith F. Survey Research: The Basics. Sage, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.