APA   Click to copy
Basten, S., & Verropoulou, G. (2013). ‘Maternity migration’and the increased sex ratio at birth in Hong Kong SAR. Population Studies, 67, 323–334.

Chicago/Turabian   Click to copy
Basten, Stuart, and Georgia Verropoulou. “‘Maternity Migration’and the Increased Sex Ratio at Birth in Hong Kong SAR.” Population studies 67 (2013): 323–334.

MLA   Click to copy
Basten, Stuart, and Georgia Verropoulou. “‘Maternity Migration’and the Increased Sex Ratio at Birth in Hong Kong SAR.” Population Studies, vol. 67, Routledge, 2013, pp. 323–34.

@article{basten2013a,
  title = {‘Maternity migration’and the increased sex ratio at birth in Hong Kong SAR},
  year = {2013},
  journal = {Population studies},
  pages = {323--334},
  publisher = {Routledge},
  volume = {67},
  author = {Basten, Stuart and Verropoulou, Georgia}
}