Artikel Jurnal
Al Rasyid, author
Medical Journal of Indonesia, 15 (1) Januari-March 2006: 30-33, 2006
Artikel Jurnal
Mecklenburg, Robert William., author
O'Reilly, 2005
Buku Teks
Oram, Andrew, author
O'Reilly & Associates, Inc., 1991
Buku Teks
Williams, Michael
Macmillan, 1986
Buku Teks