Becker, Edward F., author
Cambridge University Press, 2012
Buku Teks
Murphey, Murray G., author
Springer, 2012
eBooks
Arif Maulana, author
2017
UI - Skripsi (Membership)
Azzouni, Jody, author
Routledge, 2000
Buku Teks
Baggini, Julian, author
Palgrave Macmillan, 2012
Buku Teks