Armstrong, Amatullah
Ferozsons, 2001
Buku Referensi
Dofka, Charline M.
Delmar, Cengage Learning, 2007
Buku Teks
Moini, Jahangir
Delmar Cengage Learning, 2010
Buku Teks
Frenay, Agnes Clare
Catholic Health Association of the United States, 1984
Buku Teks
Cohen, Barbara Janson
Wolters Kluwer, 2008
Buku Teks