APA   Click to copy
Colwell, R. K. (2008). RangeModel: Tools for exploring and assessing geometric constraints on species richness (the mid-domain effect) along transects. Ecography, 31, 4–7.

Chicago/Turabian   Click to copy
Colwell, Robert K. “RangeModel: Tools for Exploring and Assessing Geometric Constraints on Species Richness (the Mid-Domain Effect) along Transects.” Ecography 31 (2008): 4–7.

MLA   Click to copy
Colwell, Robert K. “RangeModel: Tools for Exploring and Assessing Geometric Constraints on Species Richness (the Mid-Domain Effect) along Transects.” Ecography, vol. 31, Munksgaard Copenhagen, 2008, pp. 4–7.

@article{colwell2008a,
  title = {RangeModel: Tools for exploring and assessing geometric constraints on species richness (the mid-domain effect) along transects},
  year = {2008},
  journal = {Ecography},
  pages = {4--7},
  publisher = {Munksgaard Copenhagen},
  volume = {31},
  author = {Colwell, Robert K}
}