Robinson, Marshall A., author
Brookings Institution, 1962
Buku Teks
Robinson, Marshall A., author
Brookings Institution, 1955
Buku Teks
Brown, A.J., author
George Allen and Unwin, 1959
Buku Teks
Brown, A.J., author
George Allen and Unwin, 1959
Buku Klasik
Lipsey, Richard G., 1928-, author
Weidenfeld and Nicolson, 1972
Buku Teks