Gar, Joseph
Dodd, Mead, 1963
Buku Teks
Ewing, J.H., editor
Dell Publishing, 1964
Buku Teks
Gaer, Joseph
Dodd, Mead, 1956
Buku Teks
Toynbee, Arnold J., author
Oxford University Press, 1956
Buku Teks
Smith, Wilfred Cantwell, author
Mizan , 2004
Buku Teks