Weerakkody, A., (2012). Which study design?. Sri Lanka Journal of Obstetrics and Gynaecology. 33(3), pp.135–138. DOI: http://doi.org/10.4038/sljog.v33i3.4025

Weerakkody A. Which study design?. Sri Lanka Journal of Obstetrics and Gynaecology. 2012;33(3):135–8. DOI: http://doi.org/10.4038/sljog.v33i3.4025

Weerakkody, A. (2012). Which study design?. Sri Lanka Journal of Obstetrics and Gynaecology, 33(3), 135–138. DOI: http://doi.org/10.4038/sljog.v33i3.4025

Weerakkody, Asoka. 2012. Which study design? 33, no. 3: 135–138. DOI: http://doi.org/10.4038/sljog.v33i3.4025