Gaya APA

Sanders, R, C., James, A, E. (1980). The principles and practice of ultrasonography in obstetrics and gynecology (2). New York: Appleton Century Crofts.

Gaya MLA

Sanders, Roger, C.., James, A., Everette. "The principles and practice of ultrasonography in obstetrics and gynecology". 2 New York: Appleton Century Crofts, 1980. Text.