APA   Click to copy
Gietel-basten, S. A., Coleman, D. A., & Billari, F. C. (2015). Population—The Long View. Population Studies, 69, S1.

Chicago/Turabian   Click to copy
Gietel-basten, Stuart Arthur, David A Coleman, and Francesco C Billari. “Population—The Long View.” Population Studies 69 (2015): S1.

MLA   Click to copy
Gietel-basten, Stuart Arthur, et al. “Population—The Long View.” Population Studies, vol. 69, 2015, p. S1.

@article{gietel-basten2015a,
  title = {Population—The Long View},
  year = {2015},
  journal = {Population Studies},
  pages = {S1},
  volume = {69},
  author = {Gietel-basten, Stuart Arthur and Coleman, David A and Billari, Francesco C}
}