McQueen, Humphrey
Penguin books, 1970
Buku Teks
Ayer, Alfred Jules, 1910-1989
Freeman, Coope, 1968
Buku Teks
Durham, William H.
Stanford University Press, 1979
Buku Teks
Vernadsky, George
At The Clarendon Press, 1959
Buku Teks
Arendt, Hannah, 1906-1975
Harcourt, Brace, 1950
Buku Teks