Lipsey, Robert E.
Princeton University Press , 1963
Buku Teks
Lenway, Stefanie Ann
Pitman, 1985
Buku Teks
League of Women Voters of the United States 1961, 1962
Buku Teks
edited with an introd. by Bela Balassa
W.W. Norton, 1964
Buku Teks
Brown, William Adams.
Washington, D.C., Brookings Institution
Buku Teks