Halpern, Siegmund
Prentice Hall of India, 1979
Buku Teks
National University of Singapore. Office of Quality Management, 2004
Multimedia
Prama Dwi Putra, author
Fakultas Hukum Universitas Indonesia, 2014
UI - Skripsi (Membership)
Boy Subirosa Sabarguna, author
Konsorsium RS Islam Jateng-DIY, 2004
Buku Teks
Chestnut, Bill, author
Addison-Wesley Longman, 1997
Buku Teks