Cambridge University Press, 1997
eBooks
Grayling, A. C.
Blackwell Publishers, 1997
Buku Teks
edited by Witold Marciszewski
Martinus Nijhoff Publishers, 1981
Buku Referensi
Vendler, Zeno
Cornell University Press, [1967]
Buku Teks
Siobhan Chapman
Oxford University Press, 2005
Buku Teks