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nih.gov
ncbi.nlm.nih.gov
Alexander, G. R.; Himes, J. H.; Kaufman, R. B.; Mor, J.; Kogan, M. (1996). „A United States national reference for fetal growth”. Obstetrics & Gynecology. 87 (2): 163—168. PMID8559516. doi:10.1016/0029-7844(95)00386-X.
Noren, H.; Luttkus, A. K.; Stupin, J. H.; et al. (2007). „Fetal scalp pH and ST analysis of the fetal ECG as an adjunct to cardiotocography to predict fetal acidosis in labor – multicenter, case control study”. J Perinat Med. 35 (5): 408—14. PMID17685855. doi:10.1515/JPM.2007.097..
Socol, M. L.; Garcia, P. M.; Riter, S. (1994). „Depressed Apgar scores, acid-base status, and neurologic outcome”. American Journal of Obstetrics & Gynecology. 170 (4): 991—8. PMID8166220. doi:10.1016/S0002-9378(94)70092-3..
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web.archive.org
Royal College of Obstetricians and Gynaecologists (RCOG). The Use of Electronic Fetal Monitoring. Evidence-based Clinical Guideline Number 8, Royal College of Obstetricians and Gynaecologists 2001. [1]Архивирано на сајту Wayback Machine (4. јануар 2020)