APA   Click to copy
Gietel-Basten, S., & Scherbov, S. (2019). Is half the world’s population really below ‘replacement-rate’? PloS One, 14, e0224985.

Chicago/Turabian   Click to copy
Gietel-Basten, Stuart, and Sergei Scherbov. “Is Half the World’s Population Really below ‘Replacement-Rate’?” PloS one 14 (2019): e0224985.

MLA   Click to copy
Gietel-Basten, Stuart, and Sergei Scherbov. “Is Half the World’s Population Really below ‘Replacement-Rate’?” PloS One, vol. 14, Public Library of Science San Francisco, CA USA, 2019, p. e0224985.

@article{gietel-basten2019a,
  title = {Is half the world’s population really below ‘replacement-rate’?},
  year = {2019},
  journal = {PloS one},
  pages = {e0224985},
  publisher = {Public Library of Science San Francisco, CA USA},
  volume = {14},
  author = {Gietel-Basten, Stuart and Scherbov, Sergei}
}