Bhatia, Kalsang; Martindale, Elizabeth A.; Rustamov, Oybek; Nysenbaum, Anthony M. Surrogate pregnancy: an essential guide for clinicians. The Obstetrician & Gynaecologist. 2009, 11 (1): 49–54. ISSN 1744-4667. doi:10.1576/toag.11.1.49.27468(英语).
Bhatia, Kalsang; Martindale, Elizabeth A.; Rustamov, Oybek; Nysenbaum, Anthony M. Surrogate pregnancy: an essential guide for clinicians. The Obstetrician & Gynaecologist. 2009, 11 (1): 49–54. ISSN 1744-4667. doi:10.1576/toag.11.1.49.27468(英语).