Erwin
2002
Artikel Jurnal
World Health Organization, 2003
Buku Teks SO
Siewert, J.R
Springer-Verlag Berlin Heidelberg , 2000
Multimedia
edited by Jamie H. Von Roenn, Judith A. Paice, Michael E. Preodor
Lange Medical Books/McGraw-Hill, 2006
Buku Teks SO
by Charles Seth Landefeld ... [and others]
McGraw-Hill, 2004
Buku Teks SO