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Lua i Stíl Chicago (17ú heag.)Nakash, R., J. Hutton, E. Jørstad-Stein, S. Gates, agus S. Lamb. Maximising Response to Postal Questionnaires – A Systematic Review of Randomised Trials in Health Research. BioMed Central, 2006.
Lua MLA (9ú heag.)Nakash, R., et al. Maximising Response to Postal Questionnaires – A Systematic Review of Randomised Trials in Health Research. BioMed Central, 2006.
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