APA   Click to copy
Colwell, R. K., Betts, B. J., Bunnell, P., Carpenter, F. L., & Feinsinger, P. (1974). Competition for the nectar of Centropogon valerii by the hummingbird Colibri thalassinus and the flower-piercer Diglossa plumbea, and its evolutionary implications. The Condor, 76, 447–452.

Chicago/Turabian   Click to copy
Colwell, Robert K, Burr J Betts, Pille Bunnell, F Lynn Carpenter, and Peter Feinsinger. “Competition for the Nectar of Centropogon Valerii by the Hummingbird Colibri Thalassinus and the Flower-Piercer Diglossa Plumbea, and Its Evolutionary Implications.” The condor 76 (1974): 447–452.

MLA   Click to copy
Colwell, Robert K., et al. “Competition for the Nectar of Centropogon Valerii by the Hummingbird Colibri Thalassinus and the Flower-Piercer Diglossa Plumbea, and Its Evolutionary Implications.” The Condor, vol. 76, American Ornithological Society, 1974, pp. 447–52.

@article{colwell1974a,
  title = {Competition for the nectar of Centropogon valerii by the hummingbird Colibri thalassinus and the flower-piercer Diglossa plumbea, and its evolutionary implications},
  year = {1974},
  journal = {The condor},
  pages = {447--452},
  publisher = {American Ornithological Society},
  volume = {76},
  author = {Colwell, Robert K and Betts, Burr J and Bunnell, Pille and Carpenter, F Lynn and Feinsinger, Peter}
}