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