APA (7th ed.) Zitazioa
Cotterill, S., Howells, K., Rhodes, S., & Bower, P. (Dec 2017). The effect of using social pressure in cover letters to improve retention in a longitudinal health study: An embedded randomised controlled retention trial. Trials. https://doi.org/10.1186/s13063-017-2090-5
Chicago Style (17th ed.) Zitazioa
Cotterill, Sarah, Kelly Howells, Sarah Rhodes, eta Peter Bower. "The Effect of Using Social Pressure in Cover Letters to Improve Retention in a Longitudinal Health Study: An Embedded Randomised Controlled Retention Trial." Trials Dec 2017. https://doi.org/10.1186/s13063-017-2090-5.
MLA (9th ed.) Zitazioa
Cotterill, Sarah, et al. "The Effect of Using Social Pressure in Cover Letters to Improve Retention in a Longitudinal Health Study: An Embedded Randomised Controlled Retention Trial." Trials, Dec 2017, https://doi.org/10.1186/s13063-017-2090-5.
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