APA   Click to copy
Colwell, R. K. (1983). Theoretical Ecology: Principles and Applications. American Ornithological Society.

Chicago/Turabian   Click to copy
Colwell, Robert K. “Theoretical Ecology: Principles and Applications.” American Ornithological Society, 1983.

MLA   Click to copy
Colwell, Robert K. Theoretical Ecology: Principles and Applications. American Ornithological Society, 1983.

@misc{colwell1983a,
  title = {Theoretical Ecology: Principles and Applications},
  year = {1983},
  publisher = {American Ornithological Society},
  author = {Colwell, Robert K}
}