Lubis, Firman, author
Masup, 2008
Buku Teks
Pour, Julius
Media Elek Komputindo, 1998
Buku Teks
Salmy Edawati Yaacob, author
Utusan Publications & Distributors Sdn Bhd, 2009
Buku Teks
Alma Rahima, author
Universitas Indonesia, 2009
UI - Skripsi (Membership)
Trulyana Tantiani, author
Fakultas Kesehatan Masyarakat Universitas Indonesia, 2007
UI - Tesis (Membership)