Palmer, E.H.
Routledge & Kegan Paul, 1956
Buku Referensi
Boyle, John Andrew
Luzac & Company, 1949
Buku Referensi
Arberry, Arthur John
Macmillan, [1958]
Buku Teks SO
Bryson, George D.
McGraw-Hill , 1964
Buku Teks
Elwell-Sutton, L. P.
Kegan Paul, Trench, Trubner, 1946
Buku Teks SO