Wolman, Yecheskel
ITB Press, 1991
Buku Referensi
Sri Sugiwati
Fakultas Ilmu Keperawatan Universitas Indonesia, 2000
UI - Laporan Penelitian
Bodner, George M.
John Wiley & Sons, 1995
Buku Teks SO
Brady, James E.
John Wiley & Sons, 1990
Buku Teks SO
Maple, James
John Murray, 1996
Buku Teks SO