Cite
Changes in placental ultrasonic appearance. I. Incidence of Grade III changes in the placenta in correlation to fetal pulmonary maturity.
MLA
Quinlan, R. W., et al. “Changes in Placental Ultrasonic Appearance. I. Incidence of Grade III Changes in the Placenta in Correlation to Fetal Pulmonary Maturity.” American Journal of Obstetrics and Gynecology, vol. 144, no. 4, Oct. 1982, pp. 468–70. EBSCOhost, widgets.ebscohost.com/prod/customlink/proxify/proxify.php?count=1&encode=0&proxy=&find_1=&replace_1=&target=https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=cmedm&AN=7124867&authtype=sso&custid=ns315887.
APA
Quinlan, R. W., Cruz, A. C., Buhi, W. C., & Martin, M. (1982). Changes in placental ultrasonic appearance. I. Incidence of Grade III changes in the placenta in correlation to fetal pulmonary maturity. American Journal of Obstetrics and Gynecology, 144(4), 468–470.
Chicago
Quinlan, R W, A C Cruz, W C Buhi, and M Martin. 1982. “Changes in Placental Ultrasonic Appearance. I. Incidence of Grade III Changes in the Placenta in Correlation to Fetal Pulmonary Maturity.” American Journal of Obstetrics and Gynecology 144 (4): 468–70. http://widgets.ebscohost.com/prod/customlink/proxify/proxify.php?count=1&encode=0&proxy=&find_1=&replace_1=&target=https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=cmedm&AN=7124867&authtype=sso&custid=ns315887.