A. F. Al-Assaf
World Health Organization, 2001
Buku Teks
Banta, H. David
Oxford University Press, 1993
Buku Teks
Pederson, Ann
W.B. Saunder , 1994
Buku Teks
Taylor, Neil
Sense, 2012
eBooks
Grimes, Charles E.
Australian National University, 1987
Buku Teks