Bullard, Reader
Oxford university Press, 1958
Buku Teks SO
Gilbert Rozman, editor
Woodrow Wilson Center Press, 2011
Buku Teks SO
Routledge, 2015
Buku Teks SO
Latourette, Kenneth Scott
Macmillan, 1951
Buku Teks SO
Latourette, Kenneth Scott
Macmillan, 1957
Buku Teks SO