Vega, Connie de la, author
Edward Elgar, 2013
Buku Referensi
Vega, Connie de la, author
Edward Elgar Publishing, 2013
Buku Referensi
Gormley, W. Paul, author
A.W. Sijthoff, 1976
Buku Teks
World Health Organization, 2003
Buku Teks
P. R. Gandhi, editor
Blackstone Press limited, 2000
Buku Teks