Aylward, R.B; ( et al ) . (). The Eradication... : Disease eradication initiatives and general health services : ensuring common principles lead to mutual benefits, ( ket. lihat Bab. 6 ) ( halaman 61-74 ). : New York: John Wiley and Sons, 1998

Aylward, R.B; ( et al ) . The Eradication... : Disease eradication initiatives and general health services : ensuring common principles lead to mutual benefits, ( ket. lihat Bab. 6 ) ( halaman 61-74 ). : New York: John Wiley and Sons, 1998,

Aylward, R.B; ( et al ) . . The Eradication... : Disease eradication initiatives and general health services : ensuring common principles lead to mutual benefits, ( ket. lihat Bab. 6 ) ( halaman 61-74 ). New York: John Wiley and Sons, 1998,