APA   Click to copy
Colwell, R. K. (1989). Hummingbirds of the Juan Fernández Islands: natural history, evolution and population status. Ibis, 131, 548–566.

Chicago/Turabian   Click to copy
Colwell, RK. “Hummingbirds of the Juan Fernández Islands: Natural History, Evolution and Population Status.” Ibis 131 (1989): 548–566.

MLA   Click to copy
Colwell, R. K. “Hummingbirds of the Juan Fernández Islands: Natural History, Evolution and Population Status.” Ibis, vol. 131, Blackwell Publishing Ltd (NOTE: that the names of the birds in the Abstract~…, 1989, pp. 548–66.

@article{colwell1989a,
  title = {Hummingbirds of the Juan Fernández Islands: natural history, evolution and population status},
  year = {1989},
  journal = {Ibis},
  pages = {548--566},
  publisher = {Blackwell Publishing Ltd (NOTE: that the names of the birds in the Abstract~…},
  volume = {131},
  author = {Colwell, RK}
}