research director, Carl Shoup
Twentieth Century Fund, 1937
Buku Teks
Bittker, Boris I., author
Federal Tax Press, 1968
Buku Teks
Eljinah Anderson, editor ; Dougkas S. Massey, editor
Ruseel sage foundation, 2001
Buku Teks SO
United Nations, 1970
Buku Teks
Chicago, Ill. Commerce Clearing House 1966,
Buku Teks