Collins, Charles
Oxford University Press, 1994
Buku Teks
Tarimo, E.
World Health Organization, 1991
Buku Teks
Porter-O`Grady, Tim
Mosby Elsevier, 2011
Buku Teks
edited by Gary E. Day and Sandra G. Leggat
Cambridge University Press, 2015
Buku Teks
Umiker, William
An Aspen , 1988
Buku Teks