Alreck, P. L., & Settle, R. B. (1985). The survey research handbook. R.D. Irwin.
Cita Chicago (17th ed.)Alreck, Pamela L., i Robert B. Settle. The Survey Research Handbook. Homewood, Ill: R.D. Irwin, 1985.
Cita MLA (9th ed.)Alreck, Pamela L., i Robert B. Settle. The Survey Research Handbook. R.D. Irwin, 1985.
Atenció: Aquestes cites poden no estar 100% correctes.