Minrath, William R.
D. Van Nostrand, 1956
Buku Teks
Elliot, Rose
Chapmans Publisher Ltd., 1994
Buku Referensi
Weisman, Roanne
Health Communications, Inc, 2003
Buku Teks
Archer, Margaret S.
Cambridge University Press, 2003
eBooks
Rogers, Wayne
Amacom, 2011
Buku Teks