Anderson, Owen J.
The natural moral law : the good after modernity
Cambridge University Press, 2012
 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
Tilley, Christopher Y.
Material culture and text: the art of ambiguity/Christopher Tilley
London Routledge 1991,
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Weston, Michael
Philosophy, literature and the human good
Routledge , 2001
 Buku Teks