Whittaker, Sir Edmund
Thomas Nelson and Sons Ltd., 1948
Buku Teks
Travis, Charles, author
Clarendon Press, 1989
Buku Teks
Park, Joe
Macmillan, [date of publication not identified]
Buku Teks
Adorno, Theodor W.
Rontledge, 1991
Buku Teks
Locke, John, author
J.M. Dent and Sons , 1947
Buku Teks