Vergani, P., Cozzolino, S., Pozzi, E., Cuttin, M. S., Greco, M., Ornaghi, S., & Lucchini, V. (2008). Identifying the causes of stillbirth: A comparison of four classification systems. American Journal of Obstetrics and Gynecology, 199(3), 319. https://doi.org/10.1016/j.ajog.2008.06.098

Vergani, Patrizia, Sabrina Cozzolino, Elisa Pozzi, Maria Serena Cuttin, Massimiliano Greco, Sara Ornaghi, and Valeria Lucchini. "Identifying the Causes of Stillbirth: A Comparison of Four Classification Systems." American Journal of Obstetrics and Gynecology 199, no. 3 (2008): 319. https://doi.org/10.1016/j.ajog.2008.06.098.

Vergani, Patrizia, et al. "Identifying the Causes of Stillbirth: A Comparison of Four Classification Systems." American Journal of Obstetrics and Gynecology, vol. 199, no. 3, 2008, p. 319, https://doi.org/10.1016/j.ajog.2008.06.098.