Moos, Malcolm
Random House, 1956
Buku Teks
The Johns Hopkins Press, 1954
Buku Teks
Malcolm, Noel
Macmillan, 1994
Buku Teks
Ellis, Ulrich, author
Melbourne University Press, 1963
Buku Teks
Public Relations Committee of the Liberal Democratic Party, 1979
Buku Teks