edited by G.W.A. Dummer, F.P. Thompson and J. Mackenzie Robertson
Pergamon Press, 1971
Buku Teks
Arnold, Pauline
Holiday House , 1963
Buku Teks
Thorne, W.J., author
Oxford University Press , 1948
Buku Teks
Bradford, Frederick A., author
Longmans, Green, 1932
Buku Teks
Rodgers, Raymond, author
Alexander Hamiltion Institute, 1962
Buku Teks