Artikel Jurnal
McEldowney, Sharron, author
Essex Longman Scientific & Technical, 1993
Buku Teks
edited by Bruce C. Alleman and Andrea Leeson
Battelle Press, 1999
Buku Teks
Metta Sinta Sari Wiria, author
Medical Journal of Indonesia, 2007
Artikel Jurnal
Devinny, Joseph S., author
Lewis Publishers, 1999
Buku Teks