Gaya APA

Sauerbrei, E, E. (). A Pratical Guide to Ultrasound in Obstetrics and Gyneology . New York: John Wiley & Sons Inc..

Gaya MLA

Sauerbrei, Eric, E.. "A Pratical Guide to Ultrasound in Obstetrics and Gyneology". New York: John Wiley & Sons Inc., . Text.