Gambaran pengetahuan ibu hamil usia remaja tentang kehamilan dan alasan hamil pada usia remaja di wilayah kerja Puskesmas Kecamatan Bruno Purworejo = Overview of pregnant adolescent s knowledge about pregnancy and the reason of their pregnancy in sub district Puskesmas Bruno Purworejo/ Ika Purnamasari - Ika Purnamasari, author (2014)