APA Citation

Stewart-Williams, S. (2007). Altruism among kin vs. nonkin: Effects of cost of help and reciprocal exchange. Evolution and Human Behavior, 28, pp. 193-198. doi:10.1016/j.evolhumbehav.2007.01.002

Chicago Style Citation

Stewart-Williams, Steve. "Altruism Among Kin Vs. Nonkin: Effects of Cost of Help and Reciprocal Exchange." Evolution and Human Behavior 28 (2007): 193-198.

MLA Citation

Stewart-Williams, Steve. "Altruism Among Kin Vs. Nonkin: Effects of Cost of Help and Reciprocal Exchange." Evolution and Human Behavior 28 (2007): 193-198.

Warning: These citations may not always be 100% accurate.