Gaya APA

Lubis, F., al, E. (1973). The traditional midwife in the Kecamatan Serpong : The Dukun Bayi Survey June 1973 . Jakarta: Universitas Indonesia, Badan Litbangkes.

Gaya MLA

Lubis, Firman., al, Et. "The traditional midwife in the Kecamatan Serpong : The Dukun Bayi Survey June 1973". Jakarta: Universitas Indonesia, Badan Litbangkes, 1973. print.