Kuznets, Simon Smith, 1901-, author
Norton & Company, 1953
Buku Teks
Makower, H., author
Macmillan, 1957
Buku Teks
Schneider, Erich, author
William Hodge, 1952
Buku Teks
Benavie, Arthur, author
Prentice-Hall, 1972
Buku Teks
Kaldor, Nicholas, author
Gerald Duckworth, 1960
Buku Teks