APA   Click to copy
Gietel-Basten, S., & Verropoulou, G. (2019). Maternity migration and the recent normalization of the sex ratio at birth in Hong Kong. Population Studies, 73, 423–438.

Chicago/Turabian   Click to copy
Gietel-Basten, Stuart, and Georgia Verropoulou. “Maternity Migration and the Recent Normalization of the Sex Ratio at Birth in Hong Kong.” Population studies 73 (2019): 423–438.

MLA   Click to copy
Gietel-Basten, Stuart, and Georgia Verropoulou. “Maternity Migration and the Recent Normalization of the Sex Ratio at Birth in Hong Kong.” Population Studies, vol. 73, Routledge, 2019, pp. 423–38.

@article{gietel-basten2019a,
  title = {Maternity migration and the recent normalization of the sex ratio at birth in Hong Kong},
  year = {2019},
  journal = {Population studies},
  pages = {423--438},
  publisher = {Routledge},
  volume = {73},
  author = {Gietel-Basten, Stuart and Verropoulou, Georgia}
}