Lasswell, Harold D.
Routledge & Kegan Paul Ltd., 1949
Buku Teks SO
Rangkuti, Freddy
Elex Media Komputindo, 2002
Buku Teks
Huddlestone, John
CRC press, 2016
eBooks
Mills, Gordon E.
Addison-Wesley, 1988
Buku Teks SO
Dyah Wahyuningsih
Fakultas Ilmu Keperawatan Universitas Indonesia, 2009
UI - Tesis Open