Chat, Le Van, author
Foreign Languagea Publishing House, 1962
Buku Teks
Frederovk A. Praeger, 1967
Buku Teks
Pike, Douglas, 1908-1974, author
MIT Press, 1968
Buku Teks
Belshaw, Horace, author
Food and Agriculture Organization of the United Nations, 1959
Buku Teks
Nurkse, Ragnar, 1907-1959, author
Oxford University Press, 1961
Buku Teks