Berg, C., & Chang, J. (2001). Pregnancy-related mortality in the United States, 1991-97 - the gaps persist. Paediatric and Perinatal Epidemiology ; volume 15, issue 4, page A3-A4 ; ISSN 0269-5022 1365-3016. https://doi.org/10.1046/j.1365-3016.2001.00381-9.x
Παραπομπή σε μορφή Chicago (17η εκδ.)Berg, Cj, και J. Chang. "Pregnancy-related Mortality in the United States, 1991-97 - the Gaps Persist." Paediatric and Perinatal Epidemiology ; Volume 15, Issue 4, Page A3-A4 ; ISSN 0269-5022 1365-3016 2001. https://doi.org/10.1046/j.1365-3016.2001.00381-9.x.
Παραπομπή σε μορφή MLA (9th εκδ.)Berg, Cj, και J. Chang. "Pregnancy-related Mortality in the United States, 1991-97 - the Gaps Persist." Paediatric and Perinatal Epidemiology ; Volume 15, Issue 4, Page A3-A4 ; ISSN 0269-5022 1365-3016, 2001, https://doi.org/10.1046/j.1365-3016.2001.00381-9.x.