Block, Dale J.
Jones and Bartlett, 2006
Buku Teks
Antoinette Adita K.
Fakultas Teknik Universitas Indonesia, 2013
UI - Skripsi Membership
Hynson, Larry M.
Ishiyaku EuroAmerica, 1990
Buku Teks SO
Aspen Publication, 1995
Buku Teks
Ginting, Desriana Elisabeth
Fakultas Kesahatan Masyarakat Universitas Indonesia, 2013
UI - Tesis Membership