Erwin
2002
Artikel Jurnal
World Health Organization, 2003
Buku Teks
edited by Jamie H. Von Roenn, Judith A. Paice, Michael E. Preodor
Lange Medical Books/McGraw-Hill, 2006
Buku Teks
edited by Jack H. Mendelson and Nancy K. Mello
McGraw-Hill, 1979
Buku Teks
Buku Teks