Cita APA

Sayer, A., Cooper, C., & Barker, D. (1997). Is lifespan determined in utero? BMJ Publishing Group.

Citación estilo Chicago

Sayer, A., C. Cooper, and D. Barker. Is Lifespan Determined in Utero? BMJ Publishing Group, 1997.

Cita MLA

Sayer, A., et al. Is Lifespan Determined in Utero? BMJ Publishing Group, 1997.