Ramsay D. T., Kent J. C., Owens R. A., Hartmann PE. Ultrasound imaging of milk ejection in the breast of lactating women.(անգլ.) // Pediatrics[en] : journal. — American Academy of Pediatrics[en], 2004. — Т. 113. — № 22. — С. 361—367. — PMID 14754950.
Ramsay D. T., Kent J. C., Owens R. A., Hartmann PE. Ultrasound imaging of milk ejection in the breast of lactating women.(անգլ.) // Pediatrics[en] : journal. — American Academy of Pediatrics[en], 2004. — Т. 113. — № 22. — С. 361—367. — PMID 14754950.