Rossi, Renzo
Macmillan, 1996
Buku Referensi
Dixon, D. F.
Longman Cheshire , 1982
Buku Teks
Wilkinson, Caroline
Cambrigde University Press , 2008
Buku Teks
Artikel Jurnal
Medical Journal of Indonesia, 12 (2) April June 2003: 103-108, 2003
Artikel Jurnal