Sitorus, Ratna, author
UI-Press, 2015
UI - Pidato
Sitorus, Ratna, author
EGC, 2006
Buku Teks
Sitorus, Ratna, author
Fakultas Ilmu Keperawatan Universitas Indonesia, 2004
UI - Tugas Akhir
Sitorus, Ratna, author
2003
UI - Laporan Penelitian
Diah Sukaesti, author
Fakultas Ilmu Keperawatan Universitas Indonesia, 2014
UI - Tesis (Membership)