editor, Frederick G. Ruffner, Ann C. Thomas, Ann Underwood, Mangoret Fisk, Harold C. Young
Gale Research, 1964
Buku Referensi
Doren, Charles van
Frederick A. Praeger , 1967
Buku Teks
Daniel, Glyn
Victoria: Penguin Books Australia, 1962
Buku Teks
Sen, Amartya, 1933-
Belknap Press of Harvard University Press, 2009
Buku Teks
Sen, Amartya, 1933-
Mass Belknap Press of Harvard University Press, 2009
Buku Teks SO