Mara, Cynthia Massie, editor; Olson, Laura Katz, editor
CRC Press, 2008
Buku Referensi
Yayasan Proklamasi, 1982
Buku Teks
Artikel Jurnal
J. Brodsky
World Health Organization, 2003
Buku Teks
Gerlach, Mary Jo Mirlenbrink
Delmar, Cengage Learning, 2014
Buku Teks