English: DuBose TJ, http://www.obgyn.net/us/us.asp?page=/us/cotm/0001/ehr2000
DuBose TJ, Cunyus JA, & Johnson L; Embryonic Heart Rate and Age. J Diagn Med Sonography 1990; 6:151-157. Schats R, Jansen CAM, & Waldimiroff JW; "Embryonic heart activity: appearance and development in early human pregnancy"; Brit J Obstet and Gynaecol, 1990; 97:989-994. Qasim SM, Sachdev R, Trias A, et al; The predictive value of first trimester embryonic heart rates in fertility patients. Obstetrics & Gynecology. 89(6):934-6, 1997 June; DuBose TJ; FETAL SONOGRAPHY, Chapter 12 Heart Rate; W. B. Saunders Co. 1996; p. 274-263.
Ovo djelo je u javno vlasništvo izdao autor: DuBose na Wikipediji na engleskom jeziku. To vrijedi za cijeli svijet. U nekim državama to nije pravno moguće; ako je tako: DuBose daje svima prava da koriste ovo djelo za bilo koju svrhu, bez ikakvih uvjeta, osim ako takvi uvjeti nisu propisani zakonom.Public domainPublic domainfalsefalse
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2009-11-30 20:13 DuBose 1500×1125× (311738 bytes) ~~~~DuBose, Terry J; this is data gathered by me and my associates, and graphed by me. I own the image. <ref>DuBose TJ, Cunyus JA, & Johnson L; Embryonic Heart Rate and Age. J Diagn Med Sonography 1990; 6:151-157. </ref> <ref>DuBose TJ, Miller MM, Mout
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