Bannon, John Francis
McGraw-Hill, 1952
Buku Teks
editors and contributors, Joseph J. Norton, Thomas L. Bloodworth ; editorial coordinator, Terry K. Pennington
Martinus Nijhoff Publishers, 1995
Buku Teks
National Geographic Society, 1955
Buku Teks
International forums of Sao Paulo and Geneva , 1956
Buku Teks
Westview Press, 1984
Buku Teks