Dekranas, 2009
Buku Referensi
Churchill, Winston, Sir, 1874-1965, author
Houghton Miffiln, 1949
Buku Teks
Coleman, Verna
Melbourne University Press, Melbourne Univ. Press
Buku Teks
Departemant of Information of Republic of Indonesia, 1969
Buku Teks
Tubbs, Carol Crellin, author
Slack Incorporated, 2012
Buku Teks