APA (7th ed.) Citation

Steiner, U., Tuljapurkar, S., Coulson, T., & Horvitz, C. (2012). Trading stages: Life expectancies in structured populations.

Chicago Style (17th ed.) Citation

Steiner, UK, S. Tuljapurkar, T. Coulson, and C. Horvitz. Trading Stages: Life Expectancies in Structured Populations. 2012.

MLA (9th ed.) Citation

Steiner, UK, et al. Trading Stages: Life Expectancies in Structured Populations. 2012.