Homour, Hugh
London Longmans Green 1957
Buku Teks
Klevac, Lou
Hyde Park Press Pty Ltd, 1970
Buku Teks
Perrine, Laurence
Harcourt, Brace College, 1992
Buku Teks
Yale University Press, 1941
Buku Teks
Lake, David
Univesity of Queensland Press, 1973
Buku Teks