Berube, Allan, author
The Free Press, 1990
Buku Teks
Wang, Yu, author
Springer Nature, 2019
eBooks
Debby Paramitasari, author
Fakultas Kesehatan Masyarakat Universitas Indonesia, 2014
UI - Skripsi (Membership)
edited by Alex E. Fernandez Jilberto and Barbara Hogenboom
Routledge, 2007
Buku Teks
Collins, Suzanne, author
Scholastic, 2015
Buku Teks