APA   Click to copy
Gotelli, N. J., & Colwell, R. K. (2001). Quantifying biodiversity: procedures and pitfalls in the measurement and comparison of species richness. Ecology Letters, 4, 379–391.

Chicago/Turabian   Click to copy
Gotelli, Nicholas J, and Robert K Colwell. “Quantifying Biodiversity: Procedures and Pitfalls in the Measurement and Comparison of Species Richness.” Ecology letters 4 (2001): 379–391.

MLA   Click to copy
Gotelli, Nicholas J., and Robert K. Colwell. “Quantifying Biodiversity: Procedures and Pitfalls in the Measurement and Comparison of Species Richness.” Ecology Letters, vol. 4, Wiley Online Library, 2001, pp. 379–91.

@article{gotelli2001a,
  title = {Quantifying biodiversity: procedures and pitfalls in the measurement and comparison of species richness},
  year = {2001},
  journal = {Ecology letters},
  pages = {379--391},
  publisher = {Wiley Online Library},
  volume = {4},
  author = {Gotelli, Nicholas J and Colwell, Robert K}
}