Gould, Nick, author
Routledge, 2016
Buku Teks
World Health Organization
World Health Organization, 1990
Buku Teks
Nina Rovinelli Heller, Alex Gitterman, editor
Routledge, 2011
Buku Teks
edited by Donnie J. Self
Teagle & Little, 1977
Buku Teks
edited by David B. Nash
total learning concepts, 1997
Buku Teks