Burns, Robert
Longmans, Green and Co. , 1957
Buku Teks
Grierson, Herbert John Clifford, Sir, 1866-1960
Chatto and Windus, 1950
Buku Teks
Daiches, David, editor
New York, Cornell University Press
Buku Referensi
Hanbury, Harold Grenville
Methuen, 1956
Buku Teks
Allen, Walter
E.P. Dutton, 1954
Buku Teks