McFarlan, Franklin Warren
Rinehart and Winston, 1973
Buku Teks
edited by Christopher G. Reddick, Jerrell D. Coggburn
CRC Press, 2008
Buku Referensi
Evi Nemeth [and seven others]
Addison-Wesley, 2018
Buku Teks
Diana Barsasella
Fakultas Kesehatan Masyarakat Universitas Indonesia, 2013
UI - Tesis Membership
Everest, Gordon C.
McGraw-Hill, 1986
Buku Teks