edited by Anthony Reid
Grolier International, 1996
Buku Referensi
Emerson, Ralph Waldo
Houghton Mifflin, 1904
Buku Teks SO
Broeze, Frank J.A.
[Publisher not identified], 1974
Buku Teks SO
Murdoch, James
Routledge , 1996
Buku Referensi
Toynbee, Arnold J.
Oxford University Press, 1956
Buku Teks SO