Gaya APA

Cherry, S, H., Merkatz, I, R. (1991). Complications of Pregnancy: Medical, Surgical, Gynecologic, Psychological, and Perinatal (4th. ed). Baltimore: Williams and Wilkins.

Gaya MLA

Cherry, Sheldon, H., Merkatz, Irwin, R. "Complications of Pregnancy: Medical, Surgical, Gynecologic, Psychological, and Perinatal". 4th. ed Baltimore: Williams and Wilkins, 1991. print.