APA   Click to copy
Colwell, R. K. (2000). A barrier runs through it… or maybe just a river. Proceedings of the National Academy of Sciences, 97, 13470–13472.

Chicago/Turabian   Click to copy
Colwell, Robert K. “A Barrier Runs through It… or Maybe Just a River.” Proceedings of the National Academy of Sciences 97 (2000): 13470–13472.

MLA   Click to copy
Colwell, Robert K. “A Barrier Runs through It… or Maybe Just a River.” Proceedings of the National Academy of Sciences, vol. 97, National Academy of Sciences, 2000, pp. 13470–72.

@article{colwell2000a,
  title = {A barrier runs through it… or maybe just a river},
  year = {2000},
  journal = {Proceedings of the National Academy of Sciences},
  pages = {13470--13472},
  publisher = {National Academy of Sciences},
  volume = {97},
  author = {Colwell, Robert K}
}