International Society of Ultrasound in Obstetrics and Gynecology. (1991). Ultrasound in obstetrics & gynecology. Parthenon Publishing.
Citação do estilo Chicago (17ª ed.)International Society of Ultrasound in Obstetrics and Gynecology. Ultrasound in Obstetrics & Gynecology. Carnforth, Inglaterra: Parthenon Publishing, 1991.
Citação MLA (8ª ed.)International Society of Ultrasound in Obstetrics and Gynecology. Ultrasound in Obstetrics & Gynecology. Parthenon Publishing, 1991.
警告：这些引文格式不一定是100％准确.