Frances, Peter
Oxford University Press, 1969
Buku Teks
Warbasse, James Peter
N.Y. Barnes & Neble , 1946
Buku Teks
Morrell, W.P.
Clarendon Press, 1960
Buku Teks
Williams, Basil, author
Oxford University, 1945
Buku Klasik
Lavell, C.F., author
Macmillan, 1919
Buku Teks