Brown, Joe David
Time Incorporated, 1961
Buku Teks SO
Hobbs, Lisa
McGraw-Hill, 1967
Buku Teks SO
Spear, Percival
The University of Michigan Press, 1961
Buku Teks
Ministry of Information, 1950
Buku Teks SO
Jakarta : Departemen Luar Negeri, 2007,
Majalah, Jurnal, Buletin