Anderson, Owen J.
The natural moral law : the good after modernity
Cambridge University Press, 2012
 Buku Teks SO
Tilley, Christopher Y.
Material culture and text: the art of ambiguity
Routledge, 1991
 Buku Teks
Garland, Henry
The Oxford companion to German literature
Oxford University Press, 1995
 Buku Referensi
Bosacki, Sandra Leanne
Culture of ambiguity: implications for self and social understanding in adolescence
Sense, 2012
 eBooks
Weston, Michael
Philosophy, literature and the human good
Routledge, 2001
 Buku Teks SO