Gaya APA

Acker, B, P, S, D. (1986). Clinical obstetrics a public healt perspective . Littleton: PSG Pub. Co., Inc..

Gaya MLA

Acker, Benyamin, P., Sachs,, David. "Clinical obstetrics a public healt perspective". Littleton: PSG Pub. Co., Inc., 1986. Text.