APA

Greenhill J., . (1949). <The >1949 year book of obstetrics and gynecology. Chicago: The Year Book Publishers.

Chicago

Greenhill J.P, . 1949. <The >1949 year book of obstetrics and gynecology. Chicago: The Year Book Publishers.

Harvard

Greenhill J., . (1949). <The >1949 year book of obstetrics and gynecology. Chicago: The Year Book Publishers.

MLA

Greenhill J.P, . <The >1949 year book of obstetrics and gynecology. Chicago: The Year Book Publishers. 1949.