Porter, A., Rapport, F., Storey, M., Snooks, H., Jones, K., Peconi, J., . . . Russell, I. (2013). Qualitative research within trials: Developing a standard operating procedure for a clinical trials unit. Trials, 14(1), p. 54. doi:10.1186/1745-6215-14-54

Porter, Alison, et al. "Qualitative Research Within Trials: Developing a Standard Operating Procedure for a Clinical Trials Unit." Trials 14, no. 1 (2013): 54.

Porter, Alison, et al. "Qualitative Research Within Trials: Developing a Standard Operating Procedure for a Clinical Trials Unit." Trials 14.1 (2013): 54.