Pollard, Arthur, author
Longman, Green, 1960
Buku Teks
Hughes, Charles W., author
Columbia University Press, 1980
Buku Referensi
Hughes, Charles W., author
Columbia University Press, 1980
Buku Referensi
Tomasowa, Francien Herlen, author
Universitas Brawijaya , 2005
Buku Teks
Eckersley, C. E. (Charles Ewart), 1892-1967, author
Longmans, Green and Co., 1953
Buku Referensi