Gorton, Gary B., author
Oxford University Press, 2012
Buku Teks
Sinek, Simon, author
Penguin, 2017
Buku Teks
Furstenberg, Friedrich, author
Leviathan House, 1974
Buku Teks
McGrath, John, author
Gramedia Pustaka Utama, 2006
Buku Teks
Duffus, Robert Luther
Norton, 1963
Buku Teks