APA (7th ed.) Citation

Hildingsson, I., Blix, E., Hegaard, H., Huitfeldt, A., Ingversen, K., Ólafsdóttír, Ó. Á., & Lindgren, H. (2015). How Long Is a Normal Labor? Contemporary Patterns of Labor and Birth in a Low-Risk Sample of 1,612 Women from Four Nordic Countries. Birth (Berkeley, Calif.), 42(4), 346-353. https://doi.org/10.1111/birt.12191

Chicago Style (17th ed.) Citation

Hildingsson, Ingegerd, Ellen Blix, Hanne Hegaard, Anette Huitfeldt, Karen Ingversen, Ólof Ásta Ólafsdóttír, and Helena Lindgren. "How Long Is a Normal Labor? Contemporary Patterns of Labor and Birth in a Low-Risk Sample of 1,612 Women from Four Nordic Countries." Birth (Berkeley, Calif.) 42, no. 4 (2015): 346-353. https://doi.org/10.1111/birt.12191.

MLA (9th ed.) Citation

Hildingsson, Ingegerd, et al. "How Long Is a Normal Labor? Contemporary Patterns of Labor and Birth in a Low-Risk Sample of 1,612 Women from Four Nordic Countries." Birth (Berkeley, Calif.), vol. 42, no. 4, 2015, pp. 346-353, https://doi.org/10.1111/birt.12191.