Lowenstein, Katharin Wendy
Hyland House Publishing , 1977
Buku Teks
Pike, Douglas, 1908-1974
Cambridge University Press, 1970
Buku Teks
Pike, Dauglas
Cambridge at the University Press, 1966
Buku Teks
edited by Gordon Greenwood
Angus and Robertson, 1969
Buku Teks
Younger, R. M.
Rigby, 1975
Buku Teks