APA   Click to copy
Panchanathan, K., & Boyd, R. (2003). A tale of two defectors: The importance of standing in the evolution of indirect reciprocity. Journal of Theoretical Biology, 224, 115–126.

Chicago/Turabian   Click to copy
Panchanathan, Karthik, and Robert Boyd. “A Tale of Two Defectors: The Importance of Standing in the Evolution of Indirect Reciprocity.” Journal of Theoretical Biology 224 (2003): 115–126.

MLA   Click to copy
Panchanathan, Karthik, and Robert Boyd. “A Tale of Two Defectors: The Importance of Standing in the Evolution of Indirect Reciprocity.” Journal of Theoretical Biology, vol. 224, 2003, pp. 115–26.

@article{karthik2003a,
  title = {A tale of two defectors: The importance of standing in the evolution of indirect reciprocity},
  year = {2003},
  journal = {Journal of Theoretical Biology},
  pages = {115-126},
  volume = {224},
  author = {Panchanathan, Karthik and Boyd, Robert}
}