APA način citiranja

Helle, S., & Lummaa, V. (2013). A trade-off between having many sons and shorter maternal post-reproductive survival in pre-industrial Finland. The Royal Society.

Čikaški stil citiranja

Helle, Samuli, i Virpi Lummaa. A Trade-off between Having Many Sons and Shorter Maternal Post-reproductive Survival in Pre-industrial Finland. The Royal Society, 2013.

MLA način citiranja

Helle, Samuli, i Virpi Lummaa. A Trade-off between Having Many Sons and Shorter Maternal Post-reproductive Survival in Pre-industrial Finland. The Royal Society, 2013.