Leyson, B.W.
New York: E.P. Dutton, 1955
Buku Teks
Publication Division , 1988
Buku Referensi
India : The Publication Division, 1895
Buku Referensi
Marshall, Alan, 1902-1984, author
F.W.,Cheshire, 1961
Buku Teks
Marks, Harry, author
Thomas Nelson, 1976
Buku Teks