editedby Robert N. Singer, Heather A. Hausenblas and Christopher M. Janelle
Wiley, 2001
Buku Teks
Guilbert, J.J.
World Health Organization, 1998
Buku Referensi
Aaron, David
UNICEF, Yayasan Harapan Permata Hati Kita, Rotary Club, Ford Foundation, 2004
Buku Referensi
Davies, Ivor K.
McGraw-Hill, 1981
Buku Teks
S. Sumardi
Departemen Pendidikan dan Kebudayaan RI, 1983
Buku Teks