Myers, Bernard S.
Oxford University Press, 956.
Buku Teks
Marcucci, Luisa
Studio Books , 1960
Buku Referensi
Wolf, Martin L.
Philosophical Library, 1958
Buku Referensi
Smith, Bernard
Oxford University Press, 1965
Buku Teks
Firth, Jack
The Ramsay Head Press, 1979
Buku Teks